JP3564307B2 - Feeder for sheet-fed printing press - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet feeding device of a sheet-fed printing press that conveys sheets (sheets) fed one by one onto a feeder board on a downstream side.
[0002]
[Prior art]
FIG. 4 is an explanatory diagram of the configuration and functions of a general sheet feeding device in a sheet-fed printing press. A general sheet-fed printing press includes a paper feeding device 51 shown in FIG. 4, a plurality of printing devices (not shown) for performing multicolor printing, a paper discharging device (not shown), a sheet stacking device provided in the paper discharging device, and the like. It is configured.
In such a sheet-fed printing press, the sheet 52 sent out one by one from the sheet feeding device 51 is subjected to predetermined printing while passing through a printing device in the next process, and subsequently, a sheet stacking device in a final process. After being stacked on the sheet discharge table, the sheet is carried out as a predetermined number of bundles to the outside.
[0003]
By the way, as shown in FIG. 4, a conventional sheet feeding device 51 includes a sheet feeding table 53 on which stacked sheets 52 are placed, a separating device (auxiliary blowing) 54, and first and second suction mechanisms 55 and 56 of a sheet feeding device. And so on. A feeder board 57 that transports the sheet 52 from the paper feeding device 51 to a first printing device (not shown) includes a biting roller 58, a feeder belt 59, a front contact 60, and the like from the upstream end to the downstream end. A plurality of rubber rollers 61 are provided above the equipment.
[0004]
The sheet feeding table 53 is configured to move up and down in accordance with the amount of sheets 52 to be stacked, whereby the height position of the uppermost sheet 52 is always set to a position suitable for unloading. It has become so. The separating device 54 functions to eliminate mistakes such as two-sheet feeding by blowing air from the upper rear end of the stacked sheets 52 to separate the sheets 52 one by one.
The first and second suction mechanisms 55 and 56 have a plurality of suction ports (vacuum suction pads) 55a and 56a, and the uppermost sheet 52 is sucked by the suction ports 55a of the first suction mechanism 55. The sheet 52 is separated one by one by the separating device 54, and the sheet 52 is sucked by the suction port 56 a of the second suction mechanism 56, accelerated toward the downstream side, and transferred to the biting roller 58 of the feeder board 57. Have been.
[0005]
The biting roller 58 is configured to come into contact with or separate from a feeding roller 62 provided at a fixed position below the sheet path line in accordance with the transfer timing of the sheet 52 to be fed. By rotating in this state, the sheet 52 to be conveyed is received from the suction port 56 a of the second suction mechanism 56 and functions to be transferred onto the feeder belt 59. The feeding roller 62 is driven to rotate in a counterclockwise direction (the direction of the arrow).
The feeder belt 59 is an endless belt around which a plurality of sets of guide rollers 63 are wound, and a part of the guide rollers 63 is connected to a printing press main body (not shown). It corresponds to speed. The front contact 60 defines a stop position of the sheet 52 fed at the downstream end of the feeder board 57, and transfers the sheet 52 to a claw of a first intermediate cylinder disposed at the entrance of the printing apparatus in the next process (not shown). are doing.
[0006]
With the above structure, the suction port 55a of the first suction mechanism 55 sucks and lifts the rear end (tail side) of the sheet 52, and the separating device 54 blows air between the sheet 52 and the pile (sheet bundle). Then, the suction port 56a of the second suction mechanism 56 sucks the sheet 52. Next, the suction port 55a of the first suction mechanism 55 releases the suction, and the suction port 56a of the second suction mechanism 56 advances from the position of the dashed line to the position of the solid line to push out the sheet 52 while accelerating it. When reaching between the feed roller 58 and the feeding roller 62, the biting roller 58 descends, bites the sheet 52, and the suction port 56a is opened.
Thereafter, the sheet 52 is pushed out onto the feeder board 57 by the rotational force of the feeding roller 62 and is delivered. A large number of rubber rollers 61 are provided on the feeder board 57. The sheet 52 is sandwiched between the rubber rollers 61 and the feeder belt 59, and the sheet 52 is transported along the feeder board 57 by the movement of the feeder belt 59. It will be conveyed to the contact 60.
[0007]
[Problems to be solved by the invention]
However, in the above-described conventional paper feeding device 51, the sheet 52 is configured to be conveyed at a high speed and fed to a printing device (not shown). Before being fed up, the feeding of the next sheet 52 is started, and each sheet 52 overlaps on the feeder board 57 like a scale and flows one after another. For this reason, the suction port 56a of the second suction mechanism 56 sucks the trailing side of the sheet 52 and sends it to the downstream side, and the biting roller 58 bites the biting side of the sheet 52.
In addition, the delivery of the sheet 52 from the suction port 56a of the second suction mechanism 56 to the biting roller 58 is performed in a state where the sheet 52 floats in the air and is affected by the air. As a result, imbalance (tilt of the sheet) during operation of the leading end position of the sheet 52 and deviation of the pitch in the flow direction of the sheet 52 occur, and the timing of the sheet 52 reaching the front contact 60 is delayed. Therefore, these problems cause a temporary stop due to a paper feeding failure and a deterioration in print quality due to a poor registration, and it has been difficult to further increase the speed of the paper feeding unit and improve the printing quality.
[0008]
The present invention has been made in view of such a situation, and an object thereof is to reduce the inclination of a sheet and delay of a flow timing, to stably transfer a sheet, and to prevent a sheet feeding defect. It is an object of the present invention to provide a sheet feeding device and a sheet feeding method for a sheet-fed printing press capable of further improving the performance and improving the registration accuracy to improve the print quality.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems of the related art, the present invention relates to a method in which sheets fed one by one from the uppermost stage of a stacked sheet bundle are transferred downstream in a state where the front end of the sheet overlaps the rear end of the preceding sheet. In a sheet feeding device of a sheet-fed printing press for transferring onto a feeder board on the side, first and second suction mechanisms are disposed above the sheet bundle, and the first and second suction mechanisms are located downstream of the first and second suction mechanisms. Then, a third suction mechanism having a plurality of sets of suction ports is provided on the conveyor, and the sheets are separated one by one by suctioning the sheets by the first suction mechanism , and the rear end of the sheets is suctioned by the second suction mechanism. The third suction mechanism receives the accelerated sheet and sucks and holds the trailing end of the sheet. The suction port of the third suction mechanism is moved to the inlet section on the feeder board. be transported until it reaches the It is way.
[0010]
Also, the present invention is a sheet-feeding apparatus for transferring sheets fed one by one from the uppermost stage of a stacked sheet bundle onto a downstream feeder board in a state where the front end of the sheet overlaps the rear end of the preceding sheet. In a paper feeder of a printing press, an upstream suction mechanism is provided above the sheet bundle, and a downstream suction mechanism that is located downstream of the upstream suction mechanism and has a plurality of sets of suction ports on a conveyor is provided. provided, as well as separated one by one by suction the trailing end of the sheet in the upstream suction mechanism, wherein the downstream while sucking and holding the trailing end of the sheet to the separated sheets received by the suction port of the downstream suction mechanism suction port of the side suction mechanism is to be conveyed to reach the inlet on the feeder board.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIGS. 1 and 2 are explanatory views of the configuration of a paper feeder according to an embodiment of the present invention provided in a sheet-fed printing press. FIG. 1 is a plan view of the paper feeder, and FIG. It is a side view of an apparatus.
As shown in FIGS. 1 and 2, a sheet feeding device 1 according to an embodiment of the present invention provided in a sheet-fed printing press includes a vertically movable sheet feeding table 3 for stacking sheets 2, and a stacked sheet bundle. (Auxiliary blowing) 4 for blowing air from the upper rear end of the first and second suction mechanisms 5, 6 disposed above the sheet bundle, and the first and second suction mechanisms 5, 6 A third suction mechanism 7 located on the downstream side. A feeder board 9 provided with a feeder belt 8 for transferring the sheet 2 to a first printing device (not shown) is provided downstream of the third suction mechanism 7, and a downstream end of the feeder board 9 is provided at the downstream end of the feeder board 9. A plurality of front contacts 10 for defining the stop position of the fed sheet 2 are arranged at intervals in the sheet width direction.
Further, a feeding roller 11 that is rotatable in a counterclockwise direction is fixedly disposed below the sheet path line, between the sheet bundle on the sheet feeding table 3 and the feeder board 9. I have. The feeder belt 8 is an endless belt around which a plurality of sets of guide rollers 12 are wound as in the related art, and is driven by a driving device (not shown).
[0013]
The separating device 4 is configured to enable the first suction mechanism 5 to suck a portion of the dozens of sheets 2 located at the upper part of the sheet bundle where the first suction mechanism 5 sucks, with a small resistance. Air is blown in advance to separate each one. Therefore, a large number of small holes (or slits) communicating with an air supply source (not shown) are formed in the front surface of the separating device 4, and the air discharged from the small holes enters between the sheets 2 like a wedge. It has a structure.
The first suction mechanism 5 sucks the uppermost sheet 2 separated by the separation device 4 and lifts the entire sheet 2 to completely separate it from the lower sheet 2. Therefore, the first suction mechanism 5 is required to follow the change of the upper surface of the sheet 2 and to separate the sheet 2 from the lower sheet 2 as soon as the sheet 2 is sucked in order to suck only one sheet 2 in a completely separated state. , A piston (not shown) is provided, and a first suction port 13 of a vacuum suction pad is provided at a lower end of the piston. The first suction ports 13 of the first suction mechanism 5 are arranged facing each other with a space therebetween in a direction (sheet width direction) orthogonal to the traveling direction of the sheet 2, and a vacuum pump or the like is provided via piping (not shown). It is connected to.
Further, the second suction mechanism 6 lifts up the first suction mechanism 5 and blows air below the sheet 2 separated by a blowing foot (not shown) to completely separate the sheet from the lower sheet. For this reason, the second suction mechanism 6 is located forward of the rear end of the sheet 2 and downstream of the first suction mechanism 5, and the second suction port (vacuum suction pad) 14 provided at the lower end thereof is In the direction (sheet width direction) orthogonal to the traveling direction of the sheet 2, they are arranged facing each other with an interval therebetween, and are connected to a vacuum pump or the like via piping (not shown) or the like.
[0014]
On the other hand, the third suction mechanism 7 is a feeder at a position which is not affected by air blown out from a blowing foot (not shown) while sucking and holding the sheet 2 received from the second suction port 14 of the second suction mechanism 6. It is transported to the entrance on the board 9. To this end, the third suction mechanism 7 includes a pair of left and right endless conveyors 15 that are spaced apart from each other in the sheet width direction and are opposed to each other. It is wound around a pair of guide rollers 16 and is configured to be able to circulate in a direction indicated by an arrow in FIG. 2 by a driving device (not shown).
[0015]
Further, a plurality of sets of third suction ports (vacuum suction pads) 17 are arranged on the conveyor 15 at intervals, and each of the third suction ports 17 is a second suction port of the second suction mechanism 6 by the conveyor 15. It moves in one direction from the vicinity of 14 to a position just above the feeding roller 11. Moreover, the moving speed of the third suction port 17 on the conveyor 15 is set to be lower than that of the feeder belt 8 on the feeder board 9, and when the third suction port 17 conveys the sheet 2 onto the feeder board 9. The sheet 2 is configured so that the sheet 2 to be conveyed by applying tension thereto is further reduced in the deflection. In FIG. 2, reference numeral 18 denotes a rubber roller provided on the feeder board 9 as necessary. The rubber roller 18 is provided to sandwich the sheet 2 between the feeder belt 8.
[0016]
In the paper feeding device 1 of the present embodiment, the first suction port 13 of the first suction mechanism 5 sucks and lifts the trailing side of the sheet 2, and a blowing foot (not shown) moves between the sheet 2 and the lower sheet 2. When the air is blown and separated into one sheet and the second suction port 14 of the second suction mechanism 6 sucks the trailing side of the sheet 2, the first suction port 13 of the first suction mechanism 5 releases the sheet 2. Then, the second suction port 14 of the second suction mechanism 6 accelerates the sheet 2 toward the downstream side, and when the third suction port 17 of the third suction mechanism 7 adsorbs the accelerated buttocks side of the sheet 2, the second suction port The second suction port 14 of the suction mechanism 6 releases the sheet 2, and the third suction port 17 receives the sheet 2.
In this state, the third suction port 17 of the third suction mechanism 7 moves while holding the trailing side of the sheet 2 as it is, and conveys it to the entrance on the feeder board 9. Place on board 9. Thereafter, when the third suction port 17 of the third suction mechanism 7 releases the sheet 2, the sheet 2 is pushed out onto the feeder belt 8 by the rotation force of the feeding roller 11 and is delivered, and the rubber roller 18 and the feeder belt 8 are transferred. With the movement of the feeder belt 8, the sheet 2 is transported along the feeder board 9 and conveyed to the front pad 10. During this time, another third suction port 17 adsorbs the trailing side of the sheet 2 in which the second suction port 14 of the second suction mechanism 6 accelerates, and the same operation is repeated, and the sheet 2 is continuously and continuously placed on the feeder board 9. Conveyed.
[0017]
The sheet feeding device 1 according to the embodiment of the present invention holds the trailing side of the sheet 2 accelerated by the second suction port 14 of the second suction mechanism 6 to the entrance on the feeder board 9 while sucking and holding the trailing side of the sheet 2 with the third suction port 17. Since the third suction mechanism 7 for conveying is provided, when the rubber roller 18 on the feeder board 9 bites the sheet 2, the sheet 2 is conveyed along the feeder board 9, and the air blown out from the blowing foot or the like is discharged. The sheet 2 is not affected and the feed speed of the feeder belt 8 is higher than the feed speed of the third suction port 17, so the tension is applied to the sheet 2 before the third suction port 17 separates the sheet 2, and the sheet 2 is stretched. The bending of the sheet 2 is less likely to occur between the sheet 2 and the rubber roller 18. As a result, the inclination of the sheet 2 and the delay of the sheet flow timing are reduced.
In addition, in the sheet feeding device 1 according to the present embodiment, since the biting roller that swings and moves is not required, it is possible to omit including the driving mechanism. In addition, the number of rubber rollers 18 on the feeder board 9 can be significantly reduced. Therefore, in the paper feeding device 1 according to the present embodiment, it is not necessary to adjust the biting pressure of the biting roller, the position of the rubber roller 18, and the like, so that labor can be saved.
[0018]
FIG. 3 is a side view of a sheet feeding device according to another embodiment of the present invention.
In the sheet feeding device 21 of the present embodiment, as a configuration different from that of the above-described embodiment of the present invention, an upstream suction mechanism 25 is provided instead of the first suction mechanism, and a downstream suction mechanism is used instead of the second and third suction mechanisms. A mechanism 26 is provided. The upstream suction mechanism 25 has the same structure and function as the first suction mechanism, and an upstream suction port 27 is provided at a lower end of a piston (not shown). The downstream suction mechanism 26 has a structure and function in which the second suction mechanism and the third suction mechanism are combined, and the conveyor 15 is provided with a movable downstream suction port 28. Other configurations are the same as those of the above-described embodiment of the present invention.
[0019]
In the sheet feeding device 21 according to the embodiment of the present invention, the upstream suction port 27 of the upstream suction mechanism 25 sucks and lifts the trailing side of the sheet 2, and the blowing foot (not shown) When the downstream suction port 28 of the downstream suction mechanism 26 sucks the trailing side of the sheet 2, the upstream suction port 27 of the upstream suction mechanism 25 separates the sheet 2. The downstream suction port 28 receives the sheet 2 and accelerates the sheet 2 toward the downstream side.
In this state, the downstream suction port 28 of the downstream suction mechanism 26 moves while holding the trailing side of the sheet 2 as it is, and conveys it to the entrance on the feeder board 9. Place on board 9. After the biting side of the sheet 2 is sandwiched between the rubber roller 18 and the feeder belt 8, the downstream suction port 28 of the downstream suction mechanism 26 releases the sheet 2. Thereafter, the sheet 2 is pushed out and transferred onto the feeder belt 8 by the rotational force of the feeding roller 11, sandwiches the sheet 2 between the rubber roller 18 and the feeder belt 8, and moves by the movement of the feeder belt 8. The sheet 2 is conveyed along the feeder board 9 and conveyed to the front pad 10. During this time, another downstream suction port 28 suctions the trailing side of the sheet 2 to which the upstream suction port 27 of the upstream suction mechanism 26 has been suctioned, and the same operation is repeated, and the sheet 2 is continuously and continuously placed on the feeder board 9. Conveyed.
[0020]
The sheet feeding device 21 according to the embodiment of the present invention accelerates while holding the trailing side of the sheet 2 sucked by the upstream suction port 27 of the upstream suction mechanism 25 by the downstream suction port 28 and accelerates the sheet 2 on the feeder board 9. Since the downstream suction mechanism 26 for transporting the paper to the entrance is provided, the same effect as in the above-described embodiment of the present invention can be obtained. In addition, in the sheet feeding device 21 according to the present embodiment, the downstream suction mechanism 26 has the function of the second suction mechanism of the present invention, so that further omission can be achieved.
[0021]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made without departing from the spirit of the present invention. is there. For example, the third suction port 17 of the third suction mechanism 7 and the downstream suction port 28 of the downstream suction mechanism 26 in the above-described embodiment may have a structure like a vacuum belt as long as the sheet 2 can be transported reliably. .
[0022]
【The invention's effect】
As described above, the sheet feeding device of the sheet-fed printing press according to the present invention is configured such that the sheets sent out one by one from the top of the stacked sheet bundle are overlapped with the rear end of the preceding sheet. in it is those transferred to the downstream side of the feeder board, with disposing the first and second suction mechanism above the sheet bundle, located on the downstream side of the first and second suction mechanism, the conveyor A third suction mechanism having a plurality of sets of suction ports is provided thereon, and the first suction mechanism sucks the sheets to separate them one by one, and the second suction mechanism suctions the rear end of the sheets to downstream. The third suction mechanism receives the accelerated sheet until the suction port of the third suction mechanism reaches the inlet on the feeder board while holding the rear end of the sheet by suction. since so as to transport The delay in the timing of the gradient and sheet flow sheet can be reduced, it can deliver the sheet to the next step reliably and stably. Therefore, according to the paper feeding apparatus of the present invention, the structure is simple, the work adjustment of each component is easy, the defective paper feeding can be prevented, the performance can be further improved, and the register accuracy can be improved. Printing quality can be improved.
[0023]
Further, another sheet feeding device of a sheet-fed printing press according to the present invention may be configured such that sheets fed one by one from the top of a stacked sheet bundle are overlapped with the rear end of the preceding sheet. And an upstream suction mechanism is disposed above the sheet bundle, and a plurality of sets of suction ports are located on the conveyor and located downstream of the upstream suction mechanism. A downstream suction mechanism having a suction end of the sheet is suctioned by the upstream suction mechanism to separate the sheets one by one, and the separated sheet is received by a suction port of the downstream suction mechanism and the rear end of the sheet is received. the so mouthpiece of the downstream suction mechanism while maintaining suction is to be conveyed to reach the inlet on the feeder board, on the same effect as the invention can be obtained, even more omission of the apparatus Can plan .
[Brief description of the drawings]
FIG. 1 is a plan view showing a sheet feeding device of a sheet-fed printing press according to an embodiment of the present invention.
FIG. 2 is a side view showing the sheet feeding device of FIG.
FIG. 3 is a side view showing a sheet feeding device of a sheet-fed printing press according to another embodiment of the present invention.
FIG. 4 is a side view showing a sheet feeding device of a conventional sheet-fed printing press.
[Explanation of symbols]
1, 21 sheet feeding device 2 sheet 3 sheet feeding table 4 separating device 5 first suction mechanism 6 second suction mechanism 7 third suction mechanism 8 feeder belt 9 feeder board 10 front contact 11 feeding roller 12 guide roller 13 first suction port 14 Second suction port 15 Conveyor 16 Guide roller 17 Third suction port 18 Rubber roller 25 Upstream suction mechanism 26 Downstream suction mechanism 27 Upstream suction port 28 Downstream suction port

Claims (3)

Sheet feeder of a sheet-fed printing press for transferring sheets sent one by one from the top of a stacked sheet bundle onto a downstream feeder board in a state where the front end of the sheet overlaps the rear end of the preceding sheet , A first suction mechanism and a second suction mechanism are disposed above the sheet bundle, and a third suction mechanism that is located downstream of the first and second suction mechanisms and has a plurality of sets of suction ports on a conveyor is provided. The first suction mechanism sucks the sheets and separates them one by one, and the second suction mechanism sucks the rear end of the sheets and accelerates them toward the downstream side. the third suction port is the third conveyor is way sheet-fed printing, characterized in that the up suction port of the suction mechanism reaches the inlet portion on the feeder board while sucking and holding the trailing end of the sheet receiving the suction mechanism Machine paper feeder. Sheet feeder of a sheet-fed printing press for transferring sheets sent one by one from the top of a stacked sheet bundle onto a downstream feeder board in a state where the front end of the sheet overlaps the rear end of the preceding sheet An upstream suction mechanism is disposed above the sheet bundle, and a downstream suction mechanism having a plurality of sets of suction ports on a conveyor is provided downstream of the upstream suction mechanism. The rear end of the sheet is sucked by the mechanism and separated one by one, and the separated sheet is received by the suction port of the downstream suction mechanism, and the suction port of the downstream suction mechanism is sucked and held at the rear end of the sheet. sheet feeding apparatus sheet-fed printing press is characterized in that so as to convey to reach the inlet on the feeder board. 3. The sheet feeding device for a sheet-fed printing press according to claim 1, wherein the moving speed of the suction port on the conveyor is set to be lower than that of the feeder belt on the feeder board.

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