JP2000034052A - Paper cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper cutting device that is capable of separating the stacked sheets of paper piece by piece and conveying them without entailing any damage to each individual paper. SOLUTION: In this paper cutting device 10, a perforated conveyor belt circulates therein, while a suction conveyor system 20, sucking up air upon passing through the underside circulating part, is installed in the upper part of a paper feed mount 12. Only a topmost sheet of paper 90 among the stacked sheets of paper 90 mounted on this paper feed mount 12 is sucked to the conveyor belt, and then it is conveyed to each side of two cutter units 40 and 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cutting device.

[0002]

2. Description of the Related Art Conventionally, sheets stacked on a sheet feeder are
2. Description of the Related Art Various types of sheet cutting apparatuses have been provided which feed out sheets one by one and cut them in a conveying direction and / or a width direction. This type of apparatus includes, for example, a paper feeding device as shown in a cross section of a main part in FIG. 1 in order to separate and feed out sheets one by one. This type of paper feeder is widely used in the field of rotary stencil printers and copiers, but the paper 2 contacting the rotating paper feed ring 4 is separated from the paper feed ring 4 by the frictional force. When the sheets are overlapped, only the sheet in contact with the sheet feeding ring 4 passes between the sheet feeding ring 4 and the separating plate 6 and is fed one by one. .

However, unlike a rotary stencil printing machine or a copying machine, a paper feeding device of a paper cutting device feeds printed or copied paper. As a result, the printed portion or the copied portion of the paper may have adverse effects such as indentation, dirt, and blurred print. In particular, such a problem is likely to occur on paper printed on both sides or color copy paper coated with a special coating.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a sheet cutting apparatus capable of separating and transporting stacked sheets one by one without damaging the stacked sheets. That is.

[0005]

SUMMARY OF THE INVENTION The present invention provides a paper cutting apparatus having the following configuration to solve the above technical problems.

[0006] The sheet cutting device is of a type that separates and conveys the sheets stacked on a sheet feeding table one by one, and cuts the sheets in the conveying direction and / or the width direction. The sheet cutting device includes an endless circulating belt member that is disposed above the sheet feeding table, a portion facing the sheet feeding table moves in the sheet conveying direction, and then returns thereabove. Suction means for sucking air through a portion of the member facing the sheet supply table, so that the sheet on the sheet supply table is adsorbed by the endless circulation belt member and transported.

In the above arrangement, the suction means sucks air from the sheet feeding table side through the portion (lower portion) of the endless circulating belt member opposed to the sheet feeding table. The endless circulation belt member may be provided with a through hole as appropriate, and air may be sucked from the through hole. Alternatively, a plurality of endless circulation belt members may be arranged with a gap, and the air may be sucked from the gap. By suction of the air to the endless circulation belt member, the top sheet of the sheets stacked on the sheet feed tray is sucked up,
It is attracted to the lower part of the paper feed circulation belt member. When the lower portion of the endless circulating belt member moves in the paper transport direction, the attracted paper is separated from the stacked paper and transported. Then, in the process of transporting the separated paper, the paper is appropriately cut in the transport direction and / or the width direction. For example, the sheet is appropriately cut in the conveying direction and / or the width direction while being conveyed by the endless circulating belt member, or while being received from the endless circulating belt member and conveyed by a pair of rollers.

According to the above configuration, the lower portion of the endless circulating belt member can separate and transport the paper on the paper feed table without strongly pressing the paper and without rubbing the paper. .

Therefore, the stacked sheets can be separated and conveyed one by one without damaging the sheets.

[0010] Preferably, air is disposed adjacent to the sheet conveying side of the sheet feeding table, and air is blown in a direction substantially opposite to the sheet conveying direction below a portion of the endless circulating belt member facing the sheet feeding table. Air blowing means for blowing, a pressing member projecting downward by a predetermined distance from between a portion of the endless circulation belt member facing the paper feeding table, and a paper width direction of the pressing member adjacent to the paper transport side of the paper feeding table. A separating member disposed on both sides and extending from below to approach the sheet transport path.

According to the above configuration, the air from the air blowing means is blown onto the upper portion of the sheets stacked on the sheet supply table, so that air enters between the sheets and the sheets are separated from each other. At this time, a part of the sheet is pressed by the pressing member and does not float, so that the sheet curves around the pressed part, thereby promoting separation of the sheet. Of the raised sheets, the top sheet is adsorbed by the endless circulation belt member and transported. At this time, the separating member arranged close to the paper transport path allows the uppermost paper that has been sucked to pass, but interferes with the lower paper, and transports the uppermost paper. So that the lower sheets do not move together.

Therefore, the paper can be separated efficiently and without damaging the paper.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a paper cutting apparatus 10 according to an embodiment of the present invention will be described in detail with reference to FIGS. 2 is an overall configuration diagram, FIG. 3 is a perspective view of a main part, FIG. 4 is a front view of the main part, FIG. 5 is a side view of the main part, FIG. 6 is a bottom view of the main part, and FIG. 7 is a block diagram.

As shown in FIG. 2, the paper cutting device 10
This is substantially the same as the conventional apparatus, and separates the sheets 90 placed on the sheet supply table 12 one by one from above and transports them by the feed roller pair 30 and the transport roller pairs 32, 34, and 36. The front and rear cutter units 40 cut off the front and rear sides of the sheet, and the left and right sides thereof are cut off by the left and right cutter units 50 if necessary, and the cut sheets are collected in the paper receiving tray 58. Paper 9 placed
The configuration of the sheet separating means for separating the sheets 0 from the top one by one and sending the separated sheets to the feed roller pair 30 is different from the conventional apparatus.
The following description focuses on the differences from the conventional apparatus.

The paper feed table 12 is moved up and down by a lifting device (not shown) driven by a paper feed table motor 13 (see FIG. 7). The position is detected by the upper limit switch 72 and the lower limit switch 74, and the movement range is limited. A side wall 14 is provided upright on the sheet conveying side (the right side in FIG. 2) of the sheet feeding table 12 so that one side of the sheet 90 placed on the sheet feeding table 12 approaches or abuts.

The upper edge 14a of the side wall 14 is disposed between the upper edge 14a of the side wall 14 and a lower surface 24s of a transport belt of the suction transport device 20 described later.
A predetermined interval is formed. On the side of the side wall 14 on the downstream side of the sheet conveyance (the side opposite to the sheet supply table 12), a urethane rubber separating plate 16 is fixed upward, and approaches or abuts on the lower surface 24s of the conveyor belt from below. Only one sheet of paper can pass between the separating plate 16.

A blow box 62 of a blow device 60 is arranged on the downstream side of the side wall 14 in the sheet conveyance. As shown in FIGS. 3 and 4, the blow box 62 is provided with an outlet 62 a at a portion directly above the paper feed table 12 without interference with the side wall 14 and the separating plate 16. I have. A discharge fan 64 is connected to the blow box 62, and air sent from the discharge fan 64 blows out from the outlet 62 a substantially along the lower surface 24 s of the conveyor belt toward the upper side of the paper feed table 12. ing.

As shown in FIG. 3, the suction conveyance device 20 generally includes a pair of drive rollers 22a and 22b, a plurality of conveyance belts 24, a suction box 26, and a suction fan 2.
8

A pair of drive rollers 22a and 22b are parallel to each other in the paper width direction (a direction perpendicular to the paper transport direction along the paper), one 22a is located above the paper feed table 12, and the other 22a.
2b are arranged on the downstream side of the sheet feeding table 12 in the sheet conveying direction.

The plurality of transport belts 24 are wound around a pair of drive rollers 22a and 22b at appropriate intervals in the axial direction (paper width direction) and circulate. That is, when the drive rollers 22a and 22b are rotated by the transport belt motor 23 (see FIG. 7), the lower portion of the transport belt 24 moves toward the downstream in the paper transport direction, while the upper portion of the transport belt 24 transports the paper. Move upstream in the direction. As shown in FIG. 3, a large number of through holes 24a penetrating in the thickness direction of each conveyor belt 24 are formed at appropriate intervals. In addition, the illustration of the through hole 24a is omitted in FIG. 4 and partially omitted in FIG.

The suction box 26 includes a pair of drive rollers 2.
2a, 22b and an inner portion surrounded by the conveyor belt 24. As shown in FIG. 6, two slits 26a are formed on the lower wall of the suction box 26 along the lower circulation portion of each conveyor belt 24, respectively.
One slit 26b is formed in each of the gaps between the four.

As shown in FIG. 3, the suction fan 28 is connected to the suction box 26, and sucks air from the slits 26a and 26b of the suction box 26. A shutter 27 that can be opened and closed is provided at a suction port of the suction fan 28, and the suction pressure can be adjusted by changing the opening degree. Shutter 2
The opening 7 can be changed by an intake solenoid 29 (see FIG. 7).

At the center of the suction conveyance device 20 in the sheet width direction,
A press plate 18 extending in the paper transport direction is provided. The holding plate 18 is a metal part whose surface is subjected to fluorine processing, and the lower part thereof is configured to protrude below the lower surface 24s of the transport belt. The downward protrusion amount can be adjusted by the adjusting screw 19.

The feed roller pair 30 and the transport roller pairs 32, 34, 36 are synchronously rotated at the same peripheral speed by a transport motor 38 (see FIG. 7). The transport motor 38 is a stepping motor, and can stop a sheet at a predetermined position with high accuracy as described later. The front and rear cutter unit 40 includes a linear upper blade 42 and a lower blade 44 extending in the sheet width direction. The lower blade 44 is fixed below the paper transport path. The upper blade 42 is supported so as to be able to traverse the paper transport path, and always retracts above the paper transport path, and is driven by the rotation of the front and rear cutter motor 46 (see FIG. 7).
The left and right cutter units 50 include a pair on both sides in the sheet width direction. The pair of left and right cutter units 50 are respectively
It is movable in the paper width direction and can be fixed at a suitable position. The left and right cutter units 50 include a left and right cutter motor 56.
(See FIG. 7), the disk-shaped upper blade 52 that rotates in synchronization with
And a lower blade 54.

Further, the configuration will be described with reference to the block diagram of FIG.

The CPU 11 has a ROM 92, a RAM 9
4, paper feed table motor 13, transport belt motor 23, transport roller pair motor 38, front and rear cutter motor 46, left and right cutter motor 56, intake solenoid 29, suction fan 28, discharge fan 64, upper limit switch 72, lower limit switch 74,
Abnormal stop switch 75, paper level sensor 78, transmission sensor to (76, 80 to 84), and operation panel 9
6 are connected.

The CPU 11 controls the operation of the sheet cutting device 10. The ROM 92 stores data such as a control program. The RAM 94 temporarily stores data such as paper cut dimensions. The paper feed table motor 13 is
Up and down. The transport belt motor 23 is provided with a transport belt 24
Drive. The transport roller motor 38 drives the feed roller pair 30 and the transport roller pairs 32, 34, 36. The front and rear cutter motor 46 includes a front and rear cutter unit 40.
Is driven. The left and right cutter motors 56 drive the upper blade 52 and the lower blade 54 of the left and right cutter unit 50. The intake solenoid 29 changes the opening of the shutter 27 provided at the suction port of the suction fan 28. Suction fan 2
8 sucks air from the slits 26a and 26b of the suction box 26. The discharge fan 64 includes the blow box 6.
The air is blown out from the second outlet 62a. Upper limit switch 7
The 2 and lower limit switches 74 detect the upper limit position and the lower limit position of the paper feed table 12. The sheet level sensor 78 detects whether there is a sheet approaching the conveyor belt lower surface 24s. The transmission sensors (76, 80-84) detect the passage of the sheet. The operation panel 96 includes operation switches and a display device.

Next, the operation of the sheet cutting device 10 will be described.

Start button on operation panel 96 (not shown)
When is pressed, the suction fan 28 and the discharge fan 64 start rotating. At this time, the suction port of the suction fan 28 is closed by the shutter 27. Next, paper feed table 1
2 rises. When the level sensor 78 detects the upper part of the paper 90 placed on the paper feed tray 12, the paper feed tray 12 stops rising, and the paper 90 on the paper feed tray 12 is moved downward by the transport belt lower surface 24.
s.

Next, as shown in FIGS. 4 and 5, air is blown into the upper portion of the paper 90 placed on the paper feed table 12 from the outlet 62a of the blow box 62, and
There is a gap between them. The area where the sheet is blown by the blowing of the air is indicated by reference symbol S in FIG. Next, the intake solenoid 29 is operated to operate the shutter 27.
Opens. As a result, in the space between the lower surface 24s of the conveyor belt and the uppermost sheet 90a on the sheet feeding table 12, air is sucked into the slits 26a and 26b of the suction box 26. Is sucked up and adsorbed on the lower surface 24s of the conveyor belt. At this time, the pressing plate 18 protrudes downward by a predetermined amount (for example, about 3 mm) from the lower surface 24s of the conveyor belt and presses the center of the sheet 90, so that only the both sides of the top sheet 90a are sucked up and pressed. Deflection occurs in the vicinity of the temperature. Another sheet 90 below this sheet 90a
As described above, air is blown into the b and 90c from the blow box 62, and is not directly sucked up to the lower surface 24s of the conveyor belt, but the center thereof is pressed downward by the pressing plate 18, and is adsorbed to the lower surface 24s of the conveyor belt. Top paper 9
0a is well separated.

Next, the transport belt 24 rotates, and the paper 90a adsorbed on the transport belt 24 passes between the transport belt 24 and the separating plate 16 and is transported to the stopped feed roller pair 30. . At this time, the separation plate 16 interferes with the other sheets 90b and 90c below the sucked sheet 90a to prevent double feeding of the sheets.

The sheet 90a sent out by the conveyor belt 24
The transport belt 24 transports the paper 90a until the leading end of the paper abuts the stopped feed roller pair 30 and the paper is bent.

The leading end of the sheet 90a is the feed roller pair 30
When the sheet is aligned along the contact line, the deflection in the sheet width direction caused by the holding plate 18 is eliminated, and the sheet is perpendicular to the conveyance direction,
The feed roller pair 30 and the transport roller pairs 32, 34,
36 starts rotating. At this time, at the same time, the intake solenoid 29 operates to close the shutter 27, and
Stop paper suction to the paper. Thereby, the paper 90a
Is smoothly transferred from the conveyor belt 24 to the feed roller pair 30 side.

The passage of the leading edge of the sheet during conveyance is detected by the transmission sensor 8.
2 is detected, the feed roller pair 30 and the transport roller pairs 32, 34, 36 are thereafter moved to the first preset position.
The sheet is fed by a predetermined distance and stopped. Then, in the stopped state, the front and rear cutter unit 40 cuts off a predetermined portion on the leading end side of the sheet. Next, the feed roller pair 30 and the transport roller pairs 32, 32, and 36 rotate again, transport the paper further by a second predetermined distance, and stop. Then, a predetermined portion on the rear end side of the sheet is cut off by the front and rear cutter unit 40. Next, the feed roller pair 30 and the transport roller pairs 32, 34, 36 rotate again to transport the paper to the paper receiving tray 58.

When the paper being conveyed passes through the left and right cutter units 50, predetermined portions on both left and right sides thereof are further cut off. Then, the paper having the four sides cut off is placed on the paper receiving tray 58 and collected.

As described above, the paper cutting device 10
Sucks the uppermost sheet 90a onto the conveyor belt 24 when only one sheet 90 is separated from the sheet supply table 12,
The sheet is conveyed while being sucked, and is delivered to the feed roller pair 30. At this time, the transport belt 24 does not strongly press or rub against the paper 90a to be transported separately.

Therefore, the stacked sheets can be separated and conveyed one by one without damaging the sheets.

The present invention is not limited to the above embodiment, but can be implemented in various modes.

For example, the presence / absence, number, arrangement order, internal configuration, cutting method, and the like of the front and rear cutter units 40 and the left and right cutter units 50 are arbitrary. For example, the left and right cutter units 50 may form perforations on both left and right sides of the sheet, but do not cut off the sheet. Also,
One sheet may be cut three or more times in the width direction, or three or more front and rear cutter units 40 may be provided and cut at three or more places in the transport direction.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of a conventional device.

FIG. 2 is an overall configuration diagram of a sheet cutting device according to an embodiment of the present invention.

FIG. 3 is a perspective view of a main part of the sheet cutting device of FIG. 2;

FIG. 4 is a front view of a main part of the sheet cutting device of FIG. 2;

FIG. 5 is a side view of a main part of the sheet cutting device of FIG. 2;

FIG. 6 is a bottom view of a main part of the sheet cutting device of FIG. 2;

FIG. 7 is a block diagram of the sheet cutting device of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Paper cutting device 11 CPU 12 Paper feed stand 14 Side wall 14a Upper edge 16 Judgment board (holding member) 18 Pressing plate (holding member) 19 Adjusting screw 20 Suction conveyance device 22a, 22b Driving roller 23 Conveyor belt motor 24 Conveyor belt (endless) (Circulation belt member) 24a Through hole 24s Belt lower surface 26 Suction box 26a, 26b Slit 27 Shutter 28 Suction fan 29 Intake solenoid 30 Feed roller pair 32-36 Transport roller pair 38 Transport motor 40 Front and rear cutter unit 42 Upper blade 44 Lower blade 46 Front and rear Cutter motor 50 Left and right cutter unit 52 Upper blade 54 Lower blade 56 Left and right cutter motor 58 Paper tray 60 Blow device 62 Blow box 62a Air outlet 64 Discharge fan 72 Upper limit switch 74 Lower limit switch 7 Abnormal stop switch 76 transmitting sensor 78 the paper level sensor 80 transmission sensor 82 transmission sensor 84 transmission sensor 90, 90a, 90b, 90c sheet 92 ROM 94 RAM 96 operation panel

Claims (2)

[Claims] 1. A paper cutting device for separating and transporting sheets (90) stacked on a paper feed table (12) one by one and cutting the paper in a transport direction and / or a width direction. An endless circulating belt member (24) disposed above (12), the portion facing the paper feed table (12) moving in the paper transport direction and returning above the paper feed table (12);
From the side, the sheet feeding table (1) of the endless circulating belt member (24)
The air is sucked through the portion facing 2), and
2) The paper (90) on the endless circulation belt member (2)
Suction means (26) to be sucked and transported by 4)
And a sheet cutting device. 2. The paper transporting device according to claim 1, wherein the paper transporting device is disposed adjacent to the paper transporting side of the paper feeding platform, and substantially under the portion of the endless circulating belt member facing the paper transporting platform. Air blowing means (62) for blowing air in a direction opposite to the direction
A pressing member (18) projecting a predetermined distance downward from a portion of the endless circulating belt member (24) opposed to the sheet feeding table (12); and a pressing member (18) adjacent to the sheet conveying side of the sheet feeding table (12). And a separating member (16) disposed on both sides of the pressing member (18) in the sheet width direction and extending from below to approach the sheet conveying path.