JP3041302B1 - Overlap assist device in sheet cutting device - Google Patents

Abstract

An overlap assisting device of a sheet cutting device includes a high-speed conveyor that conveys a sheet cut by the sheet cutting device, and a sheet that is conveyed by the high-speed conveyor and conveys the sheet to a sheet stacking unit. A low-speed conveyor, and an air nozzle and a flow straightening plate disposed at an overlap portion between the high-speed conveyor and the low-speed conveyor. The air nozzle blows air in the vicinity of the low-speed conveyor in an upward direction and in a direction opposite to the sheet flow. The straightening vane is arranged near the end of the high-speed conveyor, and is configured to receive air from the air nozzle and direct the air upward. [Effect] By simply spraying air continuously from the air nozzle, the preceding sheet and the succeeding sheet can be reliably overlapped without causing jamming and the like, there are no moving parts, a very simple configuration and adjustment is possible. It will be very easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overlap between a preceding sheet and a succeeding sheet when a sheet cut by a rotary cutter or the like for cutting a sheet-like object such as paper into a sheet stacking section. The present invention relates to an overlap assisting device for assisting.

[0002]

2. Description of the Related Art Conventionally, an overlap portion of a sheet stacking portion of a rotary cutting machine is composed of a high-speed conveyor portion and a low-speed conveyor portion, and the sheets sent one by one by the high-speed conveyor are temporarily overlapped by the low-speed conveyor portion. A method is adopted in which the speed is reduced by wrapping and the sheets are accumulated in an accumulation section.

In this case, the most problematic problem is that when a sheet moves from a high-speed conveyor to a low-speed conveyor, the leading edge of a succeeding sheet collides with the trailing edge of the preceding sheet, causing jamming.

Conventionally, as the most frequently used countermeasures, there is a scheme as schematically shown in FIGS. 6 and 7 of the accompanying drawings. As shown in FIG. 6, the conventional system includes a high-speed conveyor unit 1 for receiving and conveying a sheet cut by a rotary cutter (not shown) and sent in the direction of an arrow, and a high-speed conveyor unit. 1, a low-speed conveyor unit 2 that conveys a sheet to a sheet stacking unit (not shown), a pressing belt unit 3 that presses sheets on belts of the high-speed conveyor unit 1 and the low-speed conveyor unit 2, and a high-speed conveyor unit. 1 comprises a suction box 4 and a blow box 5 arranged between the low speed conveyor section 1 and the low speed conveyor section 2. A suction fan 6 is connected to the suction box 4, and a blow fan 7 is connected to the blow box 5. The low-speed conveyor section 2 includes a catch roll 8.

In such a conventional system, the rear end of the sheet that has shifted from the high-speed conveyor section 1 to the low-speed conveyor section 2 is sucked by the suction box 4 while measuring the timing, and the front end of the succeeding sheet is reversed. The leading edge of the succeeding sheet can overlap the trailing edge of the preceding sheet without colliding with the trailing edge of the preceding sheet after being blown up by the blow box 5.

[0006]

In order to suck the trailing edge of the preceding sheet in the conventional system, it is necessary to suck only the trailing edge at delicate timing. As a conventional method for this purpose, slits 4A in the sheet flow direction are provided on the surface of the suction box 4 at a certain interval over the entire width, as schematically shown in a partial plan view schematically shown in FIG. A kind of damper plate 4B for opening and closing the slit 4A is provided.
A method of opening and closing while shifting B with good timing is adopted. The opening and closing of the slit 4A by the damper plate 4B is also controlled by a motor 4D that is controlled in proportion to the operation of a cutter unit for sheet cutting by a rotary cutter or the like, or by a cam driven by mechanical interlock such as a line shaft. This is performed by reciprocating the damper plate 4B via 4C.

However, in such a conventional system, it becomes more difficult to take timing as the speed becomes higher, and there are many failures due to mechanical wear and the like, which is the biggest problem in the overlap portion. By the way,
It is not uncommon for current high-speed sheet cutters to have a speed of 4 to 5 times / sec.

As another mechanical method, there is a method in which the trailing edge of a preceding sheet is pushed down by a roll to instantaneously move up and down while taking a timing so as not to touch the leading edge of the succeeding sheet, or a method in which a crossbar is rotated to rotate There is a method of pushing down the rear end of the sheet, all of which require extremely delicate control and a complicated mechanical structure, and may damage the sheet.

An object of the present invention is to provide an overlap assisting device in a sheet cutting device which can solve the problems of the prior art as described above.

[0010]

According to the present invention, in an overlap assisting device in a sheet cutting device, a high-speed conveyor for conveying a sheet cut by the sheet cutting device, and a sheet conveyed by the high-speed conveyor. A low-speed conveyor that receives the sheet and conveys the sheet to a sheet stacking unit; and an air nozzle and a flow straightening plate disposed in an overlap portion between the high-speed conveyor and the low-speed conveyor. Air is blown upward from between the belts of the conveyor and in the direction opposite to the flow of the sheet.The current plate is disposed near the end of the high-speed conveyor and receives the air from the air nozzle to receive the air. It is configured to be directed upward.

According to one embodiment of the present invention, the air nozzle is capable of adjusting pressure or position.

According to another embodiment of the present invention, in the overlap assisting device of the sheet cutting device, a high-speed conveyor for conveying a sheet cut by the sheet cutting device, and a sheet conveyed by the high-speed conveyor. A low-speed conveyor that receives a sheet and conveys the sheet to a sheet stacking unit, and includes a guide plate and a rectifying plate disposed in an overlap portion between the high-speed conveyor and the low-speed conveyor, and the rectifying plate includes: The guide plate is disposed near an end of the high-speed conveyor, and the guide plate is disposed to extend from the straightening plate to immediately before the low-speed conveyor, and the guide plate has a lower side of the guide plate. An air nozzle hole or a slit is formed from above and in a direction toward the flow straightening plate,
The air nozzle holes or slits are configured to blow air upward and in a direction opposite to the flow of the sheet, and the straightening plate is configured to receive the air from the air nozzle holes or slits and direct the air upward. ing.

According to yet another embodiment of the present invention,
The guide plate and the rectifying plate are formed integrally by bending a plate, and the air nozzle holes are formed by stamping the plate. In the case of an air nozzle slit, it can be formed by overlapping the ends of two plates at a certain interval vertically.

According to yet another embodiment of the present invention,
The upper and lower belts of the high-speed conveyor and the lower and upper belts of the low-speed conveyor can be individually driven by variable-speed driving systems. The speed of each of the belts is changed or the timing is measured so as to prevent a collision with the belt, so that the belt can be stopped instantaneously. Of course, in the case of an instantaneous stop, the upper and lower belts are simultaneously stopped and activated.

According to yet another embodiment of the present invention,
The drive system includes an AC servomotor.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which: FIG.

FIG. 1 is a diagram schematically showing a configuration of an overlap assisting device in a sheet cutting device as one embodiment of the present invention. As shown in FIG. 1, the overlap assisting device of this embodiment is cut from a cutter unit 10 such as a rotary cutting machine that continuously cuts a band-shaped sheet material such as a band-shaped paper into a sheet of a desired length. High-speed conveyor 20 for conveying incoming sheets, and high-speed conveyor 20
Receiving the sheet conveyed by the sheet stacker 4
0, a low-speed conveyor 30 for transporting the high-speed conveyor 20, an air nozzle 70 and a rectifying plate 80 disposed at an overlap portion between the high-speed conveyor 20 and the low-speed conveyor 30, and a high-speed The belt includes a conveyor holding belt 50 and a low-speed conveyor holding belt 60 for holding a sheet on the belt of the low-speed conveyor 30.

In the middle of the high-speed conveyor 20, there is provided a reject gate 21 for rejecting a defective sheet outside the machine, as is generally the case. The defective sheet is dropped to the defective sheet receiver 22 by the operation of the reject gate 21. The air nozzle 70 is connected to an air pipe 71, and the air pipe 71 is provided with a pipe 7 provided with a pressure reducing control valve 73 on the way.
Air is blown from the blow fan 74 through 2.

As shown in the partial plan view of FIG. 2, the arrangement of the air nozzle 70 is indicated by an arrow A between a plurality of belts arranged at intervals of the low-speed conveyor 30.
As shown by the arrow, air is blown upward and in the opposite direction to the flow of the sheet. This air nozzle 70
For example, a copper pipe (approximately φ6) may be bent so that the tip is cut off obliquely. On the other hand, as shown in FIG. 1, the current plate 80 is located near the end of the high-speed conveyor 20,
For example, a plurality of belts juxtaposed at an interval of the high-speed conveyor 20 are disposed at or immediately after the final return roll, and the belt is arranged to receive air from the air nozzle 70 and direct the air upward. .

Next, the overlap assisting action of the air nozzle 70 and the flow regulating plate 80 will be described with reference to FIG. FIG. 3 shows a high speed conveyor 20 and a low speed conveyor 30 in the system shown generally in FIG.
5 shows details of an overlap portion between them. As shown by an arrow A, the air blown obliquely upward and in the opposite direction to the sheet flow direction from the gap between the belts of the low-speed conveyor 30 by the air nozzle 70 as shown by an arrow A,
The flow is directed toward the current plate 80 along the lower surface of the sheet S1 on the belt of the low-speed conveyor 30, and the lower surface of the sheet S1 is set to a negative pressure according to Bernoulli's law. As shown by, an effect of quickly attracting downward is exerted. After that, the flow of the air hits the slope of the current plate 80,
The sheet S2 which turns upward and shifts from the high-speed conveyor 20 to the low-speed conveyor 30 is blown upward as indicated by an arrow C. Therefore, as described above, the leading end of the succeeding sheet S2 is placed above the trailing end of the preceding sheet S1 sucked on the belt of the low-speed conveyor 30 according to Bernoulli's law. It is possible to overlap smoothly without collision.

In this embodiment, the pressure of the air blown out from the air nozzle 70 can be adjusted by the pressure-reducing control valve 73, and the position of the air outlet of the air nozzle 70 can be adjusted. .

Furthermore, in the embodiment of FIG. 1, the driving of the belt of the high-speed conveyor 20, the driving of the high-speed conveyor holding belt 50, the driving of the low-speed conveyor 30 and the driving of the low-speed conveyor holding belt 60 are each A.
It can be individually driven by a variable speed motor including C servo motors 91, 92 and 93 or a drive system having a mechanical speed change mechanism. As described above, it is preferable that the driving of the upper and lower belts of the high-speed conveyor unit and the low-speed conveyor unit can be freely changed by independent drive systems in the following points.

In the system shown in FIG. 1, normally, the number of sheets rejected by the reject gate 21 is one.
In some cases, there may be only one sheet, or two, three,... In general, drop one, drop two, ...
However, in this case, the timing of continuous conveyance is incorrect, and the leading edge of the succeeding sheet collides with the trailing edge of the preceding sheet, causing jamming and stopping the machine. There can be. However, by detecting one sheet dropped, two sheets dropped, three sheets dropped,... In the reject gate 21 and controlling each AC servomotor accordingly, the speed of the upper and lower belts in the overlap portion can be individually momentarily changed. By performing the adjustment such that the timing is instantaneously adjusted by changing or stopping the operation, jamming can be prevented. Of course, in the case of an instantaneous stop, the upper and lower belts are stopped at the same time, the preceding paper is made to stand by in the overlapped state, and the succeeding paper is overlapped thereon and activated instantaneously.

In addition, even in a normal state where no defective sheet is generated, the AC servomotors 91, 92, 9
By controlling the speeds of the upper and lower belts individually by controlling the speeds of the upper and lower belts 3, it is possible to adjust the overlap ratio very easily.

FIG. 4 shows a schematic configuration of an overlap assisting device in a sheet cutting device as another embodiment of the present invention. 4, the same components as those of the apparatus of FIG. 1 are denoted by the same reference numerals. As shown in FIG. 4, in this embodiment, a guide plate / rectifier plate 100 formed by bending a plate-like body is disposed between a high-speed conveyor 20 and a low-speed conveyor 30. . The guide plate and current plate 100 includes a current plate portion 80A and a guide plate portion 80A.
B. The current plate portion 80A is arranged near the end of the high-speed conveyor 20, and is provided with a guide plate portion 80B.
Are arranged so as to extend from the current plate portion 80A to immediately before the low-speed conveyor 30, and act to guide the sheets S1, S2,... Sent from the high-speed conveyor 20 toward the low-speed conveyor 30. Fulfill. Further, a plurality of air nozzle holes 70A are formed in the guide plate portion 80B so as to extend from the lower side of the guide plate portion 80B to the upper side and toward the rectifying plate portion 80A. The shape of the air nozzle hole 70A is not limited to this.

FIG. 5A shows a guide plate / rectifier plate 100.
FIG. 5B is a partially enlarged cross-sectional view showing a cross-sectional shape of the air nozzle hole 70A. As best shown in FIG. 5, the air nozzle hole 70A
Are formed at predetermined intervals on the guide plate portion 80B of the guide plate / rectifier plate 100, and in this embodiment, are formed by stamping a plate-like body. As shown by arrows in FIG. 5, these air nozzle holes 70A are configured to blow air upward and in a direction opposite to the flow of the sheet. On the other hand, as shown by the arrow in FIG.
And is configured to direct the air upward upon receiving air from the air.

FIGS. 5C and 5D show another embodiment which can be used in place of the guide plate / rectifier plate 100 described above with reference to FIGS. 5A and 5B. It is a figure similar to each of A) and (B). In the embodiment shown in FIGS. 5C and 5D, the guide plate / rectifying plate 100A is composed of two plates, that is, the rectifying plate portion 101.
A of the first plate 10 which has A and forms a part of the guide plate portion
1 and a second plate 102 which, together with a part of the first plate 101, provides a guide plate portion. As is well shown in the partial cross-sectional view of FIG. 5D, the end of the first plate 101 opposite to the rectifying plate portion 101A is slightly bent in a waveform, and the second plate The ends of 102 are superimposed one above the other at an interval so that an air nozzle slit 70B is provided therebetween. The effect of the air nozzle slit 70B is the same as that of the air nozzle hole 70A.

As shown in FIG. 4, the lower portion of the guide plate portion 80B where the air nozzle hole 70A (or the air nozzle slit 70B) is formed,
The blow box 71A is connected and the blow fan 74A
From the air nozzle 70A (or the air nozzle slit 70B) through the blow box 71A.
And blows out continuously from The action of the air blown from the air nozzle hole 70A (or the air nozzle slit 70B) on each of the sheets S1, S2,... Is the same as the action of the air blown from the air nozzle 70 as described with reference to the embodiment of FIG. Since there is, it will not be described again here. In FIG. 4, reference numeral L indicates an overlap portion of the sheet. Since the guide plate also functions as a kind of air table, there is almost no frictional resistance between the sheet and the guide plate, and there is no hindrance to the advance of the sheet.

[0029]

According to the overlap assisting device of the present invention, the overlap between the preceding sheet and the succeeding sheet can be reliably performed without causing jamming or the like by merely blowing air continuously from the air nozzle, and the movable device is movable. With no parts, the configuration is very simple and the adjustment is very easy.

Only by adjusting the air pressure of the air nozzle by the pressure reducing valve and adjusting the position of the outlet of the air nozzle, it is possible to cope with sheets of various materials and various sheet conveying speeds without causing inconvenience such as jamming. Thus, the sheets can be reliably overlapped.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a configuration of an overlap assisting device in a sheet cutting device as one embodiment of the present invention.

FIG. 2 is a partial plan view of the overlap assisting device of FIG. 1;

FIG. 3 is a partial view for explaining the operation of the overlap assisting device of FIG. 1;

FIG. 4 is a diagram schematically showing a configuration of an overlap assisting device in a sheet cutting device as another embodiment of the present invention.

FIG. 5 is a view showing a detailed configuration of a guide plate / rectifier plate used in the overlap assisting device of FIG. 4;

FIG. 6 is a schematic diagram showing a configuration of an overlap assisting device in a conventional sheet cutting device.

FIG. 7 is a partial plan view of the conventional overlap assisting device of FIG. 6;

[Description of Signs] 10 Cutter section of rotary cutting machine 20 High-speed conveyor 21 Reject gate 22 Defective sheet receiver 30 Low-speed conveyor 40 Sheet stacking section 50 High-speed conveyor holding belt 60 Low-speed conveyor holding belt 70 Air nozzle 70A Air nozzle hole 70B Air nozzle slit 71 Air pipe 71A Blow box 72 Piping 73 Pressure control valve 74 Blow fan 74A Blow fan 80 Rectifier plate 80A Rectifier plate 80B Guide plate 91 AC servomotor 92 AC servomotor 93 AC servomotor 100 Guide plate / rectifier plate 100A Guide plate / rectifier plate

Claims (6)

(57) [Claims] 1. An overlap assisting device in a sheet cutting device, wherein a high-speed conveyor for conveying a sheet cut by the sheet cutting device, and a sheet conveyed by the high-speed conveyor is conveyed to a sheet stacking section. A low-speed conveyor, and an air nozzle and a flow straightening plate disposed in an overlap portion between the high-speed conveyor and the low-speed conveyor,
The air nozzle is configured to blow air upward from between the belts of the low-speed conveyor and in a direction opposite to the flow of the sheet, and the rectifying plate is disposed near an end of the high-speed conveyor, and the air from the air nozzle is provided. The overlap assisting device is configured to turn the air upward upon receiving the air. 2. The overlap assisting device according to claim 1, wherein the air nozzle is capable of adjusting pressure or position. 3. A high-speed conveyor for conveying a sheet cut by the sheet cutting apparatus, and a sheet conveyed by the high-speed conveyor and conveyed to a sheet stacking section. A low-speed conveyor, and a guide plate and a rectifying plate disposed at an overlap portion between the high-speed conveyor and the low-speed conveyor, wherein the rectifying plate is disposed near an end of the high-speed conveyor. The guide plate is arranged to extend from the straightening plate to immediately before the low-speed conveyor, and the guide plate has a direction from a lower side of the guide plate to an upper side and toward the straightening plate. An air nozzle hole or a slit is formed in the air nozzle, and the air nozzle hole or the slit is The airflow is blown in a direction opposite to the flow of the air, and the flow straightening plate is configured to receive the air from the air nozzle hole or the slit and direct the air upward. apparatus. 4. The guide plate and the rectifying plate are formed integrally by bending a plate-like body or formed by overlapping ends of two plates, and the air nozzle holes or slits are formed by overlapping the ends of the two plates. 4. The overlap assisting device according to claim 3, wherein the overlap assisting device is formed by a stamping process of the plate-like body or is formed by an overlapping portion of ends of the two plates. 5. An upper and lower belt of the high-speed conveyor and an upper and lower belt of the low-speed conveyor can be individually driven by variable-speed driving systems, respectively. 5. The overlap assisting device according to claim 1, wherein the speed of each of the belts is changed or a timing is measured so as to stop instantaneously so as to prevent a collision with a leading edge of a succeeding sheet. 6. The overlap assisting device according to claim 5, wherein the drive system includes an AC servomotor.