JP4017756B2 - Paper cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet cutting apparatus.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various types of sheet cutting apparatuses have been provided that feed sheets stacked on a sheet feed tray one by one and cut them in the transport direction and / or width direction. This type of apparatus is provided with a sheet feeding device as shown in the cross section of the main part of FIG. 1, for example, in order to separate and feed sheets one by one. This type of paper feeding device is widely used in the fields of rotary stencil printing machines, copiers, and the like. However, the paper 2 that contacts the rotating paper feeding ring 4 is fed by the friction force to the paper feeding ring 4 and the separating plate 6. When the sheets overlap each other, only the sheet in contact with the sheet feed ring 4 passes between the sheet feed ring 4 and the separating plate 6 and is sent out one by one. .
[0003]
By the way, the paper feeding device of the paper cutting device feeds a printed or copied paper, unlike a rotary stencil printing machine or a copying machine. It may have adverse effects such as indentation, smudges, and fading on the printed or copied parts of the paper. In particular, such a problem is likely to occur in paper that has been printed on both sides or color copy paper that has been specially coated.
[0004]
[Problems to be solved by the invention]
Therefore, a technical problem to be solved by the present invention is to provide a sheet cutting device that can separate and convey the stacked sheets one by one without damaging the stacked sheets.
[0005]
[Means for Solving the Problems]
In order to solve the above technical problem, the present invention provides a paper cutting device having the following configuration.
[0006]
The sheet cutting device is of a type that separates sheets stacked on a sheet feed tray one by one and transports them to a pair of feed rollers, and then cuts the sheets in the transport direction and / or width direction. The paper cutting device is disposed above the paper feed table, and a portion facing the paper feed table moves in the paper transport direction and then returns through the endless circulation belt member, and the supply of the endless circulation belt member. A pressing member that protrudes a predetermined distance downward from between the portions facing the paper table,
Air is sucked from the sheet feed table through the portion of the endless circulation belt member facing the sheet feed table, and the paper on the sheet feed table is deflected in the vicinity of the portion pressed by the pressing member. in the suction means to be conveyed is adsorbed to the endless circulating belt member,
With
Until the leading ends of the sheets fed by the plurality of endless circulation belt members come into contact with the stopped feed roller pair, the endless circulation belt is bent until the sheet is bent in the direction intersecting the sheet conveyance direction. After the sheet is conveyed, the feed roller pair starts to rotate.
[0007]
In the above configuration, air is sucked by the suction means from the sheet feed table side through the portion (lower portion) of the endless circulation belt member that faces the sheet feed table. The endless circulation belt member may be appropriately provided with a through hole, and air may be sucked from the through hole, or a plurality of endless circulation belt members may be provided with a gap and air may be sucked from the gap. By suction of air to the endless circulation belt member, the uppermost sheet among the sheets stacked on the sheet feed table is sucked up and adsorbed to the lower portion of the sheet feed circulation belt member. When the lower part of the endless circulation belt member moves in the paper transport direction, the sucked paper is separated from the stacked paper and transported. Then, in the process of transporting the separated paper, it is appropriately cut in the transport direction and / or the width direction. For example, the sheet is appropriately cut in the conveyance direction and / or the width direction while being conveyed by the endless circulation belt member or while being received from the endless circulation belt member and conveyed by the roller pair.
[0008]
According to the above configuration, the lower portion of the endless circulation belt member can separate and convey the paper on the paper feed tray without strongly pressing against the paper and without rubbing the paper.
[0009]
Therefore, the stacked sheets can be separated and conveyed one by one without damaging the stacked sheets.
[0010]
Preferably, the air blowing is arranged adjacent to the sheet conveying side of the sheet feeding table, and blows air in the direction opposite to the sheet conveying direction to the lower side of the endless circulation belt member facing the sheet feeding table. And a separating member that is disposed on both sides in the sheet width direction of the pressing member adjacent to the sheet conveying side of the sheet feeding table and extends from below to approach the sheet conveying path.
[0011]
According to the above configuration, the air from the air blowing means is blown onto the upper part of the sheets stacked on the paper feed table, the air enters between the sheets, and the sheets are separated from each other. At this time, a part of the paper is pressed by the pressing member and does not float up, so the paper is curved around the pressed part, thereby promoting the separation of the paper. Of the lifted paper, the top paper is sucked and conveyed by the endless circulation belt member. At this time, the separating member arranged close to the paper transport path allows the uppermost paper adsorbed to pass, but interferes with the lower paper and transports the top paper. At the same time, the lower sheet is prevented from moving together.
[0012]
Therefore, the paper can be separated efficiently and without damaging the paper.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a sheet 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 relevant parts, FIG. 4 is a front view of relevant parts, FIG. 5 is a side view of relevant parts, FIG. 6 is a bottom view of relevant parts, and FIG.
[0014]
As shown in FIG. 2, the paper cutting device 10 is configured in substantially the same manner as the conventional device, and separates the paper 90 placed on the paper feed tray 12 one by one from the top, and feed roller pair 30, Also, while being transported by the transport roller pairs 32, 34, and 36, the front and rear are cut off by the front and rear cutter units 40, and if necessary, the left and right sides are cut off by the left and right cutter units 50, and the cut paper is transferred to the paper tray 58. Although the paper is to be collected, the configuration of the paper separating means for separating the paper 90 placed on the paper feed tray 12 one by one from the top and feeding it to the feed roller pair 30 is different from that of the conventional apparatus. Below, it demonstrates centering around difference with the conventional apparatus.
[0015]
The paper feed tray 12 is moved up and down by a lifting device (not shown) driven by a paper feed motor 13 (see FIG. 7). The position is detected by the upper limit switch 72 and the lower limit switch 74, and the moving range is limited. A side wall 14 is erected on the paper transport side (right side in FIG. 2) of the paper feed tray 12 so that one side of the paper 90 placed on the paper feed stand 12 approaches or abuts.
[0016]
A predetermined interval is formed between the upper edge 14a of the side wall 14 and the lower surface 24s of the conveying belt 20 of the suction conveying device 20 described later in detail. A urethane rubber separating plate 16 is fixed upward on the paper conveyance downstream side of the side wall 14 (opposite to the paper feed tray 12), and approaches or comes into contact with the lower surface 24s of the conveying belt from the lower side. Only one sheet can pass between the separating plates 16.
[0017]
A blow box 62 of the blow device 60 is disposed on the side of the side wall 14 where the paper is conveyed. As shown in FIGS. 3 and 4, the blow box 62 is provided with an air outlet 62 a in a portion directly facing the upper side of the paper feed tray 12 without being interfered with the side wall 14 and the separating plate 16. Yes. A discharge fan 64 is connected to the blow box 62, and the air sent from the discharge fan 64 is blown out from the air outlet 62a toward the upper side of the sheet feed table 12 substantially along the lower surface 24s of the conveying belt. ing.
[0018]
As shown in FIG. 3, the suction conveyance device 20 generally includes a pair of drive rollers 22 a and 22 b, a plurality of conveyance belts 24, a suction box 26, and a suction fan 28.
[0019]
The pair of drive rollers 22a and 22b are parallel to each other in the sheet width direction (perpendicular to the sheet conveyance direction along the sheet), one 22a is above the sheet feed table 12, and the other 22b is sheet from the sheet feed table 12. They are arranged on the downstream side in the transport direction.
[0020]
The plurality of conveying belts 24 are looped around the pair of driving rollers 22a and 22b with appropriate intervals in the axial direction (paper width direction). That is, when the driving rollers 22a and 22b are rotated by the conveyance belt motor 23 (see FIG. 7), the lower portion of the conveyance belt 24 moves toward the downstream side in the sheet conveyance direction, while the upper portion of the conveyance belt 24 conveys the sheet. Move upstream in the direction. As shown in FIG. 3, each conveying belt 24 is formed with a large number of through holes 24a penetrating in the thickness direction at appropriate intervals. The illustration of the through hole 24a is omitted in FIG. 4 and partly in FIG.
[0021]
The suction box 26 is disposed in an inner portion surrounded by the pair of drive rollers 22 a and 22 b and the transport belt 24. As shown in FIG. 6, two slits 26 a are provided on the lower wall of the suction box 26 along the lower circulation portion of each conveyor belt 24, and one gap is provided in the gap between the conveyor belts 24. A slit 26b is formed.
[0022]
As shown in FIG. 3, the suction fan 28 is connected to the suction box 26 and sucks air from the slits 26 a and 26 b of the suction box 26. The suction port of the suction fan 28 is provided with a shutter 27 that can be opened and closed, and the suction pressure can be adjusted by changing the opening degree. The opening degree of the shutter 27 is changed by an intake solenoid 29 (see FIG. 7).
[0023]
A holding plate 18 extending in the paper conveyance direction is provided at the center of the suction conveyance device 20 in the paper width direction. The pressing plate 18 is a metal part whose surface is processed with fluorine, and a lower portion thereof protrudes downward from the lower surface 24s of the conveyor belt. This downward protrusion amount can be adjusted by the adjusting screw 19.
[0024]
The feed roller pair 30 and the transport roller pairs 32, 34, and 36 are rotated at the same peripheral speed in synchronization by a transport motor 38 (see FIG. 7). The conveyance motor 38 is a stepping motor, and can stop the paper at a predetermined position with high accuracy, as will be described later. The front / rear cutter unit 40 includes a linear upper blade 42 and a lower blade 44 extending in the paper width direction. The lower blade 44 is fixed to the lower side of the sheet conveyance path. The upper blade 42 is supported so as to be able to traverse the paper transport path, and is normally retracted above the paper transport path and driven by the rotation of the front / rear cutter motor 46 (see FIG. 7). The left and right cutter unit 50 includes a pair on both sides in the paper width direction. The pair of left and right cutter units 50 are movable in the paper width direction and can be fixed at appropriate positions. The left and right cutter unit 50 includes a disk-shaped upper blade 52 and a lower blade 54 that rotate in synchronization with a left and right cutter motor 56 (see FIG. 7).
[0025]
Further, the configuration will be described with reference to the block diagram of FIG.
[0026]
The CPU 11 includes a ROM 92, a RAM 94, a paper feed motor 13, a conveyor belt motor 23, a conveyor roller pair motor 38, a front and rear cutter motor 46, a left and right cutter motor 56, an intake solenoid 29, a suction fan 28, a discharge fan 64, and an upper limit switch 72. , A lower limit switch 74, an abnormal stop switch 75, a paper level sensor 78, transmission sensors {circle around (1)} to {circle around (4)} (76, 80 to 84), and an operation panel 96 are connected.
[0027]
The CPU 11 controls the operation of the paper 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 moves the paper feed table 12 up and down. The conveyor belt motor 23 drives the conveyor belt 24. The conveyance roller motor 38 drives the feed roller pair 30 and the conveyance roller pairs 32, 34, and 36. The front / rear cutter motor 46 drives the upper blade 42 of the front / rear cutter unit 40. The left and right cutter motor 56 drives the upper blade 52 and the lower blade 54 of the left and right cutter unit 50. The intake solenoid 29 changes the opening degree of the shutter 27 provided at the suction port of the suction fan 28. The suction fan 28 sucks air from the slits 26 a and 26 b of the suction box 26. The discharge fan 64 blows out air from the air outlet 62 a of the blow box 62. The upper limit switch 72 and the lower limit switch 74 detect the upper limit position and the lower limit position of the paper feed tray 12. The paper level sensor 78 detects whether there is a paper approaching the lower surface 24s of the conveyor belt. The transmission sensors {circle around (1)} to {circle around (4)} (76, 80 to 84) detect passage of paper. The operation panel 96 includes operation switches and a display device.
[0028]
Next, the operation of the sheet cutting apparatus 10 will be described.
[0029]
When a start button (not shown) on the operation panel 96 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, the paper feed tray 12 is raised. When the level sensor 78 detects the upper part of the paper sheet 90 placed on the paper feed tray 12, the paper feed tray 12 stops rising, and the paper sheet 90 on the paper feed tray 12 comes close to the lower surface 24s of the conveyor belt. .
[0030]
Next, as shown in FIGS. 4 and 5, air is blown into the upper portion of the paper 90 placed on the paper feed tray 12 from the air outlet 62 a of the blow box 62, and a gap is formed between the paper 90. . An area where the paper is separated by the blowing of air is indicated by a symbol S in FIG. Next, the intake solenoid 29 operates to open the shutter 27. As a result, air is sucked into the slits 26 a and 26 b of the suction box 26 in the space between the lower surface 24 s of the transport belt and the uppermost sheet 90 a on the sheet feeding table 12. The uppermost sheet 90a is sucked and adsorbed to 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 conveying belt and presses the center of the sheet 90. Therefore, only the both sides of the uppermost sheet 90a are sucked and pressed. Deflection occurs near the minute. As described above, air is blown from the blow box 62 to the other sheets 90b and 90c below the sheet 90a and is not directly sucked up to the lower surface 24s of the conveyor belt, and the center thereof is pressed downward by the pressing plate 18. The uppermost sheet 90a adsorbed on the lower surface 24s of the transport belt is sufficiently separated.
[0031]
Next, the conveyance belt 24 rotates, and the sheet 90a adsorbed to the conveyance belt 24 passes between the conveyance belt 24 and the separating plate 16 and is conveyed to the stopped feed roller pair 30. At this time, the separating plate 16 interferes with the other sheets 90b and 90c below the sucked sheet 90a to prevent the sheets from being double-fed.
[0032]
The conveying belt 24 conveys the sheet 90a until the leading end of the sheet 90a sent out by the conveying belt 24 hits the stopped feed roller pair 30 and the sheet is bent.
[0033]
When the leading edge of the sheet 90a is aligned along the contact line of the feed roller pair 30 and the deflection in the sheet width direction formed by the pressing plate 18 is eliminated and becomes perpendicular to the transport direction, the feed roller pair 30 and the transport roller pairs 32, 34 , 36 starts to rotate. At the same time, the intake solenoid 29 operates to close the shutter 27 and stop the adsorption of the paper onto the conveyor belt 24. As a result, the sheet 90a is smoothly transferred from the transport belt 24 to the feed roller pair 30 side.
[0034]
When the transmission sensor {circle over (3)} 82 detects the passage of the leading edge of the paper being transported, the feed roller pair 30 and the transport roller pairs 32, 34, and 36 then stop feeding the paper by a first predetermined distance set in advance. To do. In the stopped state, the front / rear cutter unit 40 cuts off a predetermined portion on the front end side of the sheet. Next, the feed roller pair 30 and the transport roller pairs 32, 32, and 36 rotate again to further transport the sheet for a second predetermined distance set in advance 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, and 36 rotate again to transport the paper to the paper receiving tray 58.
[0035]
Further, when the sheet being conveyed passes through the left and right cutter units 50, predetermined portions on both the left and right sides are further cut off. Then, the paper with the four sides cut off is placed on the paper tray 58 and collected.
[0036]
As described above, when the sheet cutting apparatus 10 separates only one sheet 90 from the sheet feed tray 12, the sheet cutting apparatus 10 sucks the uppermost sheet 90a onto the conveying belt 24, conveys it in an adsorbed state, and feeds it. Delivered to roller pair 30. At this time, the conveyance belt 24 does not strongly press or rub against the sheet 90a to be conveyed separately.
[0037]
Therefore, the stacked sheets can be separated and transported one by one without damaging them.
[0038]
In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.
[0039]
For example, the presence / absence, number, arrangement order, internal configuration, cutting method, etc. of the front / rear cutter unit 40 and the left / right cutter unit 50 are arbitrary. For example, the left and right cutter units 50 may only form perforations on the left and right sides of the sheet, and the sheet may not be cut off. Further, 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 in 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 apparatus.
FIG. 2 is an overall configuration diagram of a sheet cutting apparatus according to an embodiment of the present invention.
3 is a perspective view of a main part of the sheet cutting device in FIG. 2;
4 is a front view of a principal part of the paper cutting device of FIG. 2;
FIG. 5 is a side view of a main part of the paper cutting device shown in FIG. 2;
6 is a bottom view of the main part of the paper cutting device of FIG. 2. FIG.
7 is a block diagram of the paper cutting device in FIG. 3;
[Explanation of symbols]
10 Paper Cutting Device 11 CPU
12 Paper feed stand 14 Side wall 14a Upper edge 16 Spread plate (spread member)
18 Presser plate (presser member)
19 Adjustment screw 20 Adsorption conveyance device 22a, 22b Drive roller 23 Conveyance belt motor 24 Conveyance 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 / rear cutter unit 42 Upper blade 44 Lower blade 46 Front / rear cutter motor 50 Left / 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 Outlet 64 Discharge fan 72 Upper limit switch 74 Lower limit switch 75 Abnormal stop switch 76 Permeation sensor (1)
78 Paper level sensor 80 Transmission sensor (2)
82 Transmission sensor (3)
84 Transmission sensor (4)
90, 90a, 90b, 90c Paper 92 ROM
94 RAM
96 Operation panel

Claims (2)

In a sheet cutting device that separates sheets (90) stacked on a sheet feed tray (12) one by one and transports them to a pair of feed rollers, and cuts the sheets in the transport direction and / or width direction,
A plurality of endless circulation belt members (24) arranged above the paper feed tray (12) and returning through the upper part of the portion facing the paper feed tray (12) after moving in the paper transport direction;
A pressing member (18) projecting a predetermined distance downward from between the portions of the endless circulation belt member (24) facing the paper feed base (12);
Air is sucked from the side of the paper feed tray (12) through the portion of the endless circulation belt member (24) facing the paper feed tray (12), and the paper (90) on the paper feed tray (12) is pressed down. A suction means (26) for adsorbing and transporting the endless circulation belt member (24) in a state of being deflected in the vicinity of a portion pressed by the member (18) ;
With
Until the leading ends of the sheets fed by the plurality of endless circulation belt members (24) abut against the stopped feed roller pair, the endless bending of the sheets occurs in the direction intersecting the sheet conveying direction. The paper cutting device according to claim 1, wherein the feed roller pair starts rotating after the circulation belt conveys the paper. It is arranged adjacent to the paper transport side of the paper feed table (12), and below the portion of the endless circulation belt member (24) facing the paper feed table (12), in a direction substantially opposite to the paper transport direction. Air blowing means (62) for blowing air into
A separating member (16) that is disposed on both sides in the sheet width direction of the pressing member (18) adjacent to the sheet conveying side of the sheet feeding table (12) and extends from below to approach the sheet conveying path. The paper cutting device according to claim 1, wherein

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