JP2001293844A - Sheet guide device for sheet-feed press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the sheet guide device for a sheet-feed press, in which even if a sheet carried to a guide gap of both the outer peripheral face of a printing cylinder and a sheet guide is a thin paper sheet, stable transfer is enabled. SOLUTION: The sheet guide device is equipped with a first air current controlling means constituted so that in the upstream side of a sheet guide, air is jetted into a guide gap formed between the outer periphery of a cylinder for printing and the sheet guide for guiding a sheet from an air blow-out port provided in the sheet guide and the sheet is floated in the inside of the guide gap and passed and in the downstream side of the sheet guide, equipped with a plurality of air suction holes opened in the downstream side part in the transfer direction of the sheet than the air blow-out port, a suction chamber storing air passed through the air suction holes and a second air current controlling means which is connected to the suction chamber and discharges air stored in the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for passing a printing sheet through a guide gap formed between an outer periphery of a printing cylinder and a sheet guide for guiding the sheet along the outer circumference of the printing cylinder. The present invention also relates to a sheet guide device for a sheet-fed printing press configured to eject air into the guide gap to cause the sheet to float and pass by the Bernoulli effect.

[Prior art]

2. Description of the Related Art Conventionally, a multicolor printing sheet-fed printing press in which a plurality of sets of printing devices having different ink colors are juxtaposed in a tandem manner is known. As shown in FIG. 39, and a plurality of sets of printing devices (13) for cyan, magenta, yellow, and black.
2a), (132b), (132c), and (132d) are composed of a printing unit (B) arranged in tandem, a delivery unit (C) as the paper discharge unit 04, and the like.

In the multi-color printing sheet-fed printing press having such a configuration, the sheets 11 stacked on the table 141 of the sheet feeding section 39 are separated one by one using a soccer section provided with a mouthpiece and conveyed. After being sent out through the first printing device 120, it is transferred to the first intermediate cylinder 121b of the first printing device 132a by the swing gripper 121a, and further sent between the blanket cylinder 22a and the impression cylinder 23a to print the first color. Is applied.

[0004] The sheet on which the printing of the first color has been completed is carried out from between the blanket cylinder 22a and the impression cylinder 23a and delivered to the intermediate cylinder 27a of the second printing device 132b. To the blanket cylinder 22b and the impression cylinder 23
Perform at b.

[0005] Printing is sequentially performed for each color, and the sheet 11 sent out between the blanket cylinder 22d and the impression cylinder 23d for printing the final stage is discharged from the discharge cylinder 3 of the delivery section C.
5, the sheet 11 after printing is transferred from the paper discharge cylinder 35 to the chain conveyor 124, transported to the paper discharge unit 04, and stacked on the table 40 of the paper discharge unit 04.

[0006]

By the way, a printing sheet 11 to be printed in a sheet-fed printing machine usually has 0.04
Thin paper of about m / m to thick paper of about 0.8 m / m is used, and sometimes a highly rigid sheet made of a metal plate or a synthetic resin is used. When the sheet is transferred from the printing device 132a for each color to the printing device 132b at the next stage, thin paper generally has low rigidity and fluttering occurs at the rear end of the sheet. In the case of a high sheet, the rear end of the sheet is separated from the impression cylinder 23 by the centrifugal force due to the rotational transfer and the reaction force (restoring force) against the bending of the sheet itself, and the lower sheet guide device 1 '.
There is a tendency for paper splash to occur.

[0007] The fluttering or splashing of paper causes stains on the printing surface, breaks and scratches on the sheet, and is a major factor in lowering print quality. For this reason, there are two typical types of the intermediate cylinder 27, a skeleton cylinder and a cylindrical cylinder, and the most suitable type is adopted depending on the rigidity of a frequently used sheet. The example illustrated in FIG. 10 is a skeleton cylinder type intermediate cylinder 27 mainly applied to a cardboard sheet. The skeleton cylinder 27 of this type is disposed at both left and right width ends of the printing apparatus 132 and is centered on an axis 270. A pair of rotating bodies (arms) that rotate
271 and a shaft 272 extending from the tip of one arm 271 to the corresponding tip of the arm 271 on the opposite side of the axis.
(Refer to FIG. 11 (A)).
9 are arranged side by side. The skeleton body 27 is a seat 11
Is characterized in that the area of contact with the impression cylinder 23 engaged through the contact is minimized. The sheet 11 to be rotated and transferred can be bent and deformed from a point (P) close to the gripper 29. That is, the close point (P) becomes the point of action, and by increasing the distance from this point to the rear end of the sheet 11, the function of reducing the reaction force for returning the sheet 11 is improved.

[0008] As a result, a paper spring whose rear end impacts against the sheet guide device 1 'provided below the skeleton-type intermediate cylinder 27 and extended in a concave arc shape along the imaginary rotation circumferential line. Although it can be softened, it is possible to reduce scratches and breakage deformation, but conversely, in the skeleton cylinder 27 of this type, the free end of the rear end of the sheet 11 to be transported increases, so that in the case of thin paper, This would cause large sheet flapping.

On the other hand, a cylindrical intermediate cylinder applied to a sheet for thin paper is characterized in that the contact area with an impression cylinder engaged via the sheet is increased, and the sheet to be rotated and transported is held in place. Since the downstream side of the claw is guided along the outer peripheral surface of the cylindrical body, the function of reducing the flutter at the rear end of the sheet is enhanced, and this function causes wrinkles generated at the rear end of the sheet and the fluttering of the paper. It can reduce problems such as doubling and scratching, but on the other hand, in the case of this type of cylindrical intermediate cylinder, when transferring thick paper, the free area of the sheet is reduced, so stronger paper splash is generated. It will be a thing.

Therefore, in such sheet-fed printing presses, in order to solve the above problems, especially in recent years, the printing quality has been improved, and the skeleton type intermediate cylinder tends to be used also for the thin paper. In order to suppress the occurrence of fluttering of sheets of thin paper, the sheet guide device 1 including an intermediate cylinder 27 and a sheet guide surface 1d provided along the lower periphery of a discharge cylinder 35 (hereinafter collectively referred to as an intermediate cylinder). ′, Air which is pressurized to a predetermined pressure and flows from a plurality of air outlets along the surface of the sheet guide surface 1d into the guide clearance formed between the intermediate body 27 and the sheet guide surface 1d. There has been proposed a sheet guide device in which the sheet 11 is ejected to the lower surface side of the passing sheet 11 and the sheet 11 is floated by Bernoulli effect by the ejected air.

As one of such sheet guide devices, there is an invention disclosed in Japanese Patent Laid-Open No. 10-109404. This technique will be described with reference to FIGS. 10 and 11. The sheet guide device 1 ′ provided along the outer periphery of the skeleton type intermediate cylinder 27 having the claws 29 or the outer circumference of the paper discharge cylinder 35 is constituted by the air duct 06. A plurality of air outlets 4a and 4b are arranged on the surface of the air duct 06, and the air outlets 4a and 4b face each other with the middle cylinder 27 or the center of the paper discharge cylinder as a boundary. The air outlets 4a and 4b discharge airflow in the opening direction to regulate the sheet 11 to a predetermined position, and are arranged in a scattered manner so as to open toward both ends of the intermediate cylinder 27. The running of the seat 11 is stabilized.

That is, according to the above-mentioned prior art, on the lower surface side of the sheet 11 gripped by the claws 29 of the skeleton type intermediate cylinder 27 suitable for thick paper, the sheet guide surface 1d having the air duct 06 on the lower surface is interposed. Along the guide gap between the torso,
Since air is ejected from the air outlets 4a and 4b in the direction along the sheet guide, the sheet conveyed along the peripheral surface of the intermediate cylinder 27 by the Bernoulli effect due to the difference in the flow velocity of the air flow between the upper and lower surfaces of the sheet. 11 is transported while being suctioned and slightly lifted to the sheet guide surface 1d side, and then transferred to the impression cylinder 23 at the next stage.

However, even in the prior art, the sheet removed from the claw of the skeleton-type intermediate cylinder at the downstream portion of the guide gap in the sheet transfer direction has no holding member, and especially in the case of thin paper. However, the end portion cannot be stably held only by the Bernoulli effect due to the flow velocity of the jet air.

In particular, when the thin paper sheet is transferred by the skeleton type intermediate cylinder 27, the occurrence of such fluttering of the sheet end and the occurrence of paper skew on the downstream side of the sheet guide surface is unavoidable. This causes printing troubles such as printing overlap, paper wrinkles, and paper tears.

The present invention has been made in view of the above-mentioned problems of the related art, and passes a sheet through a guide gap formed between the outer periphery of a printing cylinder and a sheet guide, and blows air from the air outlet of the sheet guide into the guide gap. In the sheet-fed printing press configured to cause fluttering and paper flapping of the sheet edge at the sheet transport direction downstream portion of the guide gap,
It is an object of the present invention to provide a sheet guide device for a sheet-fed printing press that enables stable transfer of thin paper sheets and that can smoothly transfer thin paper sheets using a skeleton type cylinder suitable for thick paper.

[Means for Solving the Problems]

In order to solve the above problem, the present invention is directed to a first aspect of the present invention, such as an intermediate cylinder or a paper discharge cylinder having an arc-shaped sheet guide surface formed on a lower peripheral surface through a guide gap. In a sheet-fed printing press including a printing cylinder and an impression cylinder and other second printing cylinders disposed in close proximity to the printing cylinder via a sheet transfer unit, an upstream of the arc-shaped sheet guide surface in a sheet transfer direction is provided. One or a plurality of air supply chambers at the rear side of the side, and an air suction chamber at the rear side of the downstream side in the sheet transport direction adjacent to the air supply chamber. First air flow control means for ejecting the air stored in the air supply chamber to float the sheet in the guide gap and pass the sheet downstream of the sheet guide; After suctioning the air into the air suction chamber through the plurality of first air suction holes opened in the downstream sheet guide surface, the air sucked into the suction chamber is discharged from the chamber wall surface different from the sheet guide surface to the outside of the chamber. And a second air flow control means for discharging air to the air.

According to this invention, since the conveyance is performed using different airflow control means on the upstream side and the downstream side of the sheet guide surface, the thin paper can be smoothly conveyed even by using the skeleton cylinder.

That is, on the upstream side of the guide gap of the sheet guide surface in the sheet transport direction, as shown in the above-mentioned prior art, the Bernoulli effect due to the flow velocity difference of the air flow between the upper and lower surfaces of the sheet leads along the intermediate drum peripheral surface. The conveyed sheet is sucked and slightly floated on the sheet guide surface side, and smooth conveyance is possible without fluttering.

At the downstream of the guide gap of the sheet guide surface in the sheet transport direction, the sheet detached from the claw of the skeleton-type intermediate body is communicated with the suction chamber even if there is no longer a member holding the sheet. Since the negative pressure is maintained by the suction of the air suction holes formed over the entire width of the sheet guide surface, the sheet from which the gripping of the claws is released is communicated with the many air suction holes. The sheet is sucked toward the front side of the sheet guide at the downstream side of the guide gap in the sheet transport direction.

Accordingly, even when printing a thin paper sheet using a skeleton-type cylinder, the sheet can be printed as follows:
Even if the end portion is disengaged from the claw of the skeleton-type intermediate body on the downstream side in the sheet transfer direction, the end portion is reliably located on the front side of the sheet guide because the negative pressure is formed by suction through the air suction hole. The sheet is prevented from fluttering and paper flapping at the end of the sheet.

Therefore, the sheet is smoothly transferred from the printing cylinder such as the intermediate cylinder to the next printing cylinder at both the upstream side and the downstream side of the sheet guide surface. Transport is possible,
Even if a skeleton type cylinder suitable for thick paper is used, the thin paper sheet can be smoothly transferred, and the occurrence of printing failure is avoided.

Further, as in the second aspect of the present invention, a plurality of ventilation portions such as stepped notches for passing the sheet gripping claws provided on the printing cylinder are formed at the downstream end of the sheet guide surface. The sheet guide device for a sheet-fed printing press according to claim 1, wherein a space (hereinafter, referred to as a lower space) facing a second printing cylinder peripheral surface is provided below a downstream end of the sheet guide surface.
It is preferable that the air flowing through the ventilation portion is sucked, and the air can be discharged from the air discharging portion together with the air sucked into the suction chamber through the first air suction hole group.

Accordingly, even if there is a possibility that the air flow flowing through the guide gap may be disturbed due to the presence of the stepped notch for passing the sheet gripping claw provided on the printing cylinder at the downstream end of the sheet guide surface. Since the air flowing through the ventilation portion is sucked, the occurrence of the turbulence is prevented, in other words, fluttering and paper spilling at the sheet rear end side are suppressed, and the delivery to the next printing cylinder is performed smoothly. .

According to a third aspect of the present invention, a part of the exhaust air discharged outside the air suction chamber is returned to the suction chamber, and the plurality of first air openings are formed on the downstream sheet guide surface.
A means for adjusting the amount of air suctioned from the air suction hole group to the air suction chamber is provided. Thus, the sheet is not sucked so strongly that the conveyance of the sheet is hindered on the downstream side in the sheet conveyance direction, and the sheet can be smoothly conveyed while suppressing the fluttering of the sheet end and the paper flutter.

According to a fourth aspect of the present invention, the discharge path of the second air flow control means is constituted by an air circulation path connecting the air suction chamber and the air supply chamber. You may comprise so that circulation is possible via the circulation pump provided in the circulation path.

According to this invention, since the air continuously circulating in the air circulation path flows through the guide gap, the air flow becomes smooth and turbulence hardly occurs. And the air circulation pump can be shared, and the cost of the apparatus can be reduced.

In this case, as in the fifth aspect of the present invention,
A part of the discharge air flow of the circulating pump is configured to return to the air suction chamber side, and air sucked into the air suction chamber from a plurality of first air suction hole groups opened on the downstream sheet guide surface. As described above, it is preferable that the suction amount is adjustable.

The first group of air suction holes formed on the sheet guide surface according to the invention of claim 6 is formed by a row of the air suction holes located at the center in the width direction of the sheet guide surface. It is preferable that the sheet is arranged with a phase in the width direction toward the upstream side or the downstream side in the sheet transport direction as it advances to both ends in the sheet width direction. For example, by arranging with a phase such that the air suction holes located at the central portion side are upstream of the air suction holes located at both ends in the sheet transport direction, the sheet transported in the guide gap is The central part of the rear end part comes off from the air suction hole first,
Finally, since both ends are separated from the air suction holes at both ends, it is suitable for thin paper or the like in which both ends of the sheet are likely to flutter or bend.

Conversely, the air suction holes located at both ends are
Both ends of the rear end of the sheet to be transferred in the guide gap by being arranged with a phase in the width direction so as to be upstream of the air suction hole located in the center side in the sheet transfer direction. Is first removed from the air suction hole, and finally, the central portion is removed from the air suction hole, which is suitable for thick paper or the like in which the central portion of the sheet tends to flutter or rip.

According to a seventh aspect of the present invention, the air suction chamber is divided into a plurality of parts by a partition in the width direction of the sheet guide, and the suction amount can be changed or opened and closed for each of the divided suction chambers. Thus, a suction and discharge control means is provided. According to such invention,
The suction force of the sheet in the width direction of the sheet guide is adjusted by adjusting the opening degree of the on-off valve constituting the suction and discharge control means and adjusting the pressure (negative pressure) in the width direction of each suction chamber. Thus, the posture of the sheet in the width direction can be controlled, and the sheet can be transported in a uniform posture.

The invention according to claim 8 is a sheet guide device for a sheet-fed printing press according to claim 2, wherein a plurality of ventilation portions such as stepped notches are formed at a downstream end of the sheet guide surface. A second air suction unit that sucks air flowing through the ventilation unit.
Air suction hole is provided on a suction chamber wall surface facing the peripheral surface of the second printing cylinder, and is configured to be able to be discharged from the air discharge section together with the air sucked into the suction chamber through the first air suction hole. It is characterized by becoming.

According to this invention, the air in the space near the downstream end of the sheet guide is sucked into the suction chamber through the second air suction hole, and the second air is sucked into the space.
An air flow having a velocity component toward the air suction hole is formed, and a negative pressure is formed in the space by the Bernoulli effect due to the air flow.

The end of the sheet is sucked to the downstream surface of the sheet guide by the negative pressure, so that the flutter of the end of the sheet and the flapping of the sheet are suppressed even at the most downstream side of the guide gap.

According to a ninth aspect of the present invention, as another embodiment of the present invention, a plurality of ventilation portions such as stepped notches are formed at a downstream end of the sheet guide surface. In the sheet guide device of the sheet-fed printing press, adjacent to the suction chamber downstream side wall surface facing the second printing cylinder peripheral surface,
A hood portion is provided on the rotating peripheral surface of the second printing cylinder below the sheet guide end, and a third air suction hole communicating with the hood portion is opened on the downstream side wall surface of the suction chamber, and The suction / discharge port is provided on the bottom of the unit, and air in the suction chamber can be discharged from the hood through a third air suction hole together with the ventilation unit.

According to this invention, since the air in the vicinity of the transfer section is collected and sucked in the hood section, scattering of the air is avoided, and adverse effects on the sheet transfer due to the scattering of the air are also avoided. The sheet can be smoothly transferred from the printing cylinder to the next printing cylinder.

Also in this case, it is preferable that the air in the hood member can be returned to the suction chamber together with the air supply chamber via a pump provided on a discharge circulation system. This is as described above.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just

FIG. 1 is a sectional view of a main part near a sheet guide portion in a first embodiment of a sheet guide device 1 of a sheet-fed printing press according to an embodiment of the present invention, and FIG. It is.

In this embodiment, as shown in FIG.
7, and a sheet guide device 1 including a sheet guide surface 1d provided along the lower periphery of a discharge cylinder 35 (hereinafter, generically referred to as an intermediate cylinder). In this embodiment, a skeleton cylinder is used as the intermediate cylinder. However, it is naturally applicable to a cylindrical body. 23 is an impression cylinder; 21 is a space between the intermediate cylinder 27 and the impression cylinder 23, particularly below the downstream end of the sheet guide surface 1d.

The sheet guide device 1 has an upper surface formed with a sheet guide surface 1d formed in an arc shape with a guide gap 15 for air flow and a lower outer periphery of the intermediate cylinder 27. Except for the downstream side in the sheet transport direction, a plurality of air supply chambers 2 are arranged on the rear side of the surface 1d, except for the downstream side in the sheet transport direction, which is divided into one or the left and right in the width direction with a central partition wall interposed therebetween. Numeral 4 designates an air outlet which is formed in a plurality of holes on the surface except the downstream side of the sheet guide 1d corresponding to the formation site of the air supply chamber 2, and as shown in FIG.
And the air supply chamber 2 to communicate with the intermediate cylinder 27
The air outlet 4c located at the center of the shaft is located upstream from the air outlet in the direction opposite to the sheet conveying direction, and the air outlets 4c located on both sides thereof.
a and 4b face each other with the center outlet 4c as a boundary, are scattered and arranged so as to open toward both ends of the intermediate body 27, and allow the air flow from the air outlet 4 in the opening direction. The sheet is ejected to regulate the sheet at a predetermined position, and the running of the sheet is stabilized.

The air supply chamber 2 and the air outlet 4
Is the same as that of the prior art, and a detailed description thereof will be omitted. However, on the lower surface side of the sheet 11 located on the upstream side of the sheet guide surface in a state of being held by the claws 29 of the skeleton type intermediate body 27, Along the guide gap 15 between the sheet guide surface 1d having the air supply chamber 2 and the intermediate body 27, the left and right air outlets 4 from the left and right air outlets 4 in the width direction or the flow side along the sheet guide surface 1d. The sheet 11 conveyed along the peripheral surface of the intermediate drum 27 is sucked toward the sheet guide surface 1d by the Bernoulli effect due to the difference in the flow velocity of the air flow between the upper and lower surfaces of the sheet. It is transported while being slightly lifted. The arrangement and the opening direction of the plurality of air outlets 4 can be arbitrarily set without being limited to the forms shown in FIGS. 2 and 11B.

As shown in FIG. 2, a sheet guide surface downstream end of the sheet guide device 1 guides paper at a downstream end in a sheet transport direction indicated by an arrow S in FIG. Due to its function, a plurality of cutouts 10 are formed in the impression cylinder 23 so that the claw passes in the width direction in a stepped manner, so that the recess 10b is formed. Make a vent. (The notches 10 may be at equal or irregular intervals).

Then, the sheet guide device 1 of the present embodiment
In the first embodiment, an air suction chamber 3 is provided on the back surface of the sheet guide surface 1d downstream from the partition wall 24 of the first air supply chamber 2 to the base end side of the cutout portion 10. The chamber 3 is formed on the downstream side of the air supply chamber 2 with a partition wall 24 interposed therebetween, and the outlet side wall surface 34 of the air suction chamber 3 is formed with the intermediate cylinder 27 and the impression cylinder 23.
Is formed on the surface facing the space 21 between the two.

Reference numeral 6 denotes an air supply pipe connected to the air supply chamber 2, and reference numeral 9 denotes an air supply pump provided in the air supply pipe 6. Reference numeral 8 denotes a group of air suction holes which are scattered and arranged in the whole area on the downstream side of the sheet guide surface 1d and are provided in communication with the suction chamber 3. As shown in FIG. 2, the air suction hole group 8 faces the guide gap 15 of the sheet guide surface 1 and is arranged at substantially equal intervals in the front, rear, left, and right directions over substantially the entire area where the suction chamber 3 is formed.

The suction chamber 3 has a wall portion 34 facing the space 21 between the intermediate cylinder 27 and the next impression cylinder 23.
In addition, a second air suction hole 28 communicating the space 21 and the suction chamber 3 is provided. The air suction hole 2
As shown in FIG. 2, a plurality of recesses 8 in the width direction of the sheet guide 1, more specifically,
Each of them is provided at a position corresponding to b.

At the lower part of the suction chamber 3, a suction port 05 is provided.
An air suction pipe 5 having an air suction pump 7 is connected to the suction port 05. A plurality of the suction ports 05 and the air suction pipes 5 are provided along the width direction of the sheet guide 1. The plurality of the air suction pipes 5 are merged into one air suction pipe. Suction pump 7
Are provided to suck the air in the suction chamber 3.

In the sheet guide device of the sheet-fed printing press having the above-mentioned configuration, as shown in FIGS. 9 to 10, the sheet 11 sent out from the impression cylinder 23 (23a) is the skeleton-type intermediate cylinder 27 (27a). And passes through the guide gap 15 formed between the intermediate body 27 and the sheet guide 1.

On the other hand, an air supply chamber 2 arranged on the upstream side of the sheet guide device 1 in the sheet transfer direction S has:
Air pressurized to a predetermined pressure by the air supply pump 9 is supplied through the air supply pipe 6. The air stored in the air supply chamber 2 is ejected from the plurality of air outlets 4 to the lower surface side of the sheet 1 passing through the guide gap 15.

The sheet 11 is drawn to the surface 1d side of the sheet guide 1 which is decompressed by the air flow according to the rotational transfer of the intermediate cylinder 27, and the sheet 11 is floated while maintaining a predetermined gap with the surface 1d. It passes through the gap 15.

Thereafter, the sheet 11, which has passed the upstream side of the sheet guide surface 1d, has a skeleton-type intermediate cylinder 27 (27) at its end, especially the rear end, especially when the sheet is thin paper.
When the sheet 11 is disengaged from the claw 29, the behavior of the sheet 11 becomes unstable, and fluttering and paper fluttering easily occur in the space 21 near the notch 10 provided in the sheet guide 1.

However, in the present embodiment, an air suction hole 8 communicating with the suction chamber 3 is provided across the entire width of the sheet guide 1 downstream of the guide gap 15 in the sheet transport direction S. In addition, since the inside of the suction chamber 3 is maintained at a negative pressure by the suction of the air suction pump 7, the vicinity of a portion of the guide gap 15 corresponding to the air suction hole 8 also has a negative pressure. Is sucked toward the front surface 1d of the sheet guide 1 downstream of the guide gap 15 in the sheet transport direction S, which is in communication with the air suction hole 8 of FIG.

Thus, even if the end of the sheet 11 is displaced from the claw 29 of the skeleton type intermediate body 27 (27a) downstream of the guide gap 15 in the sheet transport direction S, the air suction hole 8 Since the negative pressure is formed by suction through the sheet guide 1, the end portion is reliably sucked toward the front surface 1 d side of the sheet guide 1, and fluttering and paper flapping of the end portion of the sheet 11 are suppressed.

The air in the vicinity of the concave portion 10b of the notch 10 provided at the downstream end of the sheet guide 1d is supplied to a second air suction hole formed in a wall of the sheet guide 1 facing the space 21. The liquid is sucked into the suction chamber 3 through 28. Thereby, the concave portion 1 of the notch 10
An air flow having a velocity component toward the second air suction hole 28 is formed near 0b, and a negative pressure is formed in the vicinity 1 of the recess 10b of the notch 10 due to the Bernoulli effect by the air flow, and the sheet 11 Is sucked toward the notch end of the sheet guide 1. Thereby, fluttering and paper flapping at the end of the sheet 11 are also suppressed at the most downstream side of the guide gap 15. Therefore, the sheet 11 is smoothly transferred from the intermediate cylinder 27 to the next impression cylinder 23.

FIG. 3 is a view corresponding to FIG. 1 showing a second embodiment of the present invention. In the second embodiment shown in FIG. 3, air circulation is performed by connecting an air suction pipe 5 connected to a suction port 05 of the suction chamber 3 and an air supply pipe 6 connected to the air supply chamber 2. A path 013 is formed, and one air circulation pump 13 is provided in the air circulation path 013. The air in the suction chamber 3 is sucked by the air circulation pump 13 so as to be located on the upstream side of the sheet guide surface 1d. It is configured to feed into one or more air supply chambers 2.

According to this embodiment, the air circulation path 0
Since the air continuously circulating through the passage 13 flows through the guide gap 15, the flow of the air becomes smooth and turbulence hardly occurs, and the sheet 11 is stably transferred in the guide gap 15. In addition, since only one air circulation pump 13 needs to be provided, the cost of the apparatus is reduced. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

FIG. 4 is a view corresponding to FIG. 2 showing a third embodiment of the present invention. In the third embodiment shown in FIG. 4, the air suction hole group 8 opened in the sheet guide 1 is
In the width direction of the sheet guide 1, the air suction holes 8 a located at the center portion side are arranged at the air suction holes 8 located at both end sides.
b and 8b, and are arranged continuously in the width direction so as to be on the upstream side in the sheet transport direction S.

According to this embodiment, the guide gap 15
The center of the rear end of the sheet 11 to be transported first comes off from the air suction holes 8a, and finally both ends come off from the air suction holes 8b, 8b at both ends. It is particularly effective for thin paper which is apt to rash. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

FIG. 5 is a view corresponding to FIG. 2 showing a fourth embodiment of the present invention. In the fourth embodiment shown in FIG. 5, the air suction holes 8 are provided in the width direction of the sheet guide 1.
The air suction holes 8d, 8d located at both ends are continuously in phase in the width direction so as to be upstream of the air suction holes 8c located at the center in the sheet transport direction S. Have been placed.

According to this embodiment, the guide gap 15
The end of the rear end of the sheet 11 to be transported first comes off the air suction holes 8d and 8d, and finally the center part comes off the air suction hole 8c. This is effective for soft paper or cardboard that is likely to be generated. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

FIG. 6 is a view corresponding to FIG. 2 showing a fifth embodiment of the present invention, and FIG. 7 is a sectional view taken along line BB of FIG. Figures 6 and 7
In the fifth embodiment, the air suction chamber 3 is divided into two suction chambers 3a and 3b by a partition 25 in the width direction of the sheet guide device 1 (3).
Or more). Then, each suction chamber 3a, 3b
Are connected to the air suction pipes 5a and 5b, respectively. The air suction pipes 5a and 5b are joined together and connected to the suction port of the air suction pump 7, and the air suction pipes 5a and 5b are opened or closed or opened. Flow control valves 16 and 16 for controlling the degree are provided.

According to this embodiment, the flow control valve 1
The two suction chambers 3 divided in the width direction of the sheet guide 1 by changing the opening degrees of the sheet guides 6 and 16.
The pressure (negative pressure) in a and 3b can be adjusted.

Therefore, by changing the pressure in the suction chambers 3a and 3b, the suction force of the sheet 11 in the width direction of the sheet guide 1 can be adjusted, whereby the sheet 11 in the width direction of the sheet guide 1 can be adjusted. Is possible, and the sheet 11 can be transported in a uniform posture. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

FIG. 8 is a view corresponding to FIG. 1 showing the sixth embodiment. In the sixth embodiment shown in FIG. 8, an air supply pipe 6a having an on-off valve 18a is connected to the bottom of the air suction chamber 3 near the upstream side in the sheet transfer direction S. Of the wall 0 located downstream of the connection of the air supply pipe 6a in the sheet transport direction S
An air exhaust hole 22 is opened at 22.

A hood 19 having a U-shaped cross section is provided adjacent to the wall 022 and below the notch 10 at the downstream end of the sheet guide surface 1d so as to open to the peripheral surface of the impression cylinder. The airflow from the notch 10 can be sucked through the space 21. The hood 19 is formed over the entire width of the sheet guide, and is opened on the peripheral surface of the impression cylinder 23 to cover a space below the hood 19.

An air discharge port 31 is provided at the bottom of the hood 19, and a plurality of the air suction ports 31 are provided at regular intervals along the width direction of the sheet guide 1 and are uniformly sucked in the width direction. It is supposed to be. An air circulating pump 13 for sucking and discharging air in the hood 19 is provided at an outlet 31 of the hood 19 through an air suction pipe 20, and a discharge side of the pump 13 is branched to supply air to the suction chamber 3. Supply pipe 6a and air supply chamber 2
are connected to air supply pipes 6b, 6c,. Reference numerals 18b and 18c denote on-off valves for opening and closing the air supply pipes 6b and 6c, respectively.

According to this embodiment, the air supply pipe 6
When the air circulating pump 13 is operated by opening the on / off valve 18a of the air circulating pump 1 as shown by the arrow in FIG.
An air circulation path extending from the air circulation pipe 13 to the air circulation pump 13 through the air supply pipe 6a, the air suction chamber 3, the air discharge hole 22, the hood 19, and the air suction pipe 20 is formed. Notch 1
The air in the vicinity of the ventilation section 0 is sucked into the hood 19 and merges with the air from the suction chamber 3 to be sucked by the air circulation pump 13.

Since the discharge side of the air circulation pump 13 is branched and connected to the air suction chamber 3 via the on-off valve 18a, the discharge side of the air suction pump 3 is controlled by the on-off control of the on-off valve 18a. A part of the discharged air discharged into the suction chamber 3 is returned to the suction chamber 3, and the amount of air suctioned into the air suction chamber through the air suction holes 8 formed in the downstream sheet guide surface 1d can be adjusted. This allows
Smooth conveyance is possible while suppressing the fluttering of the sheet end and the paper skew without causing strong suction so that the conveyance of the sheet is hindered on the downstream side in the sheet conveyance direction.

Therefore, according to this embodiment, the air is
The air circulation path from the air circulation pump 13 to the air circulation pump 13 through the suction chamber 3 and the hood 19 is circulated, and the air near the notch 10 is sucked through the hood 19 by an ejector action by this air flow. As a result, in the guide gap 15, the negative pressure is maintained in the entire area downstream of the sheet guide from the portion corresponding to the suction chamber 3 to the vicinity of the notch 10. Accordingly, the sheet 11 can be smoothly transported without flapping or paper skew at the end. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

Although the above embodiment is a sheet guide device provided on the intermediate cylinder 27, the present invention can be applied to a sheet guide device provided on a paper discharge cylinder and a printing cylinder.
In the case of printing a thin paper sheet using a skeleton-type cylinder, a negative pressure is formed by suction through the air suction hole even when an end of the sheet comes off the claw of the skeleton-type intermediate cylinder. Therefore, the end portion is reliably sucked toward the front side of the sheet guide, and the fluttering and the paper flapping of the sheet end portion are suppressed.

Therefore, the sheet is smoothly transferred from the printing cylinder, such as the intermediate cylinder, to the next printing cylinder, so that a thin paper sheet can be stably transported, which is suitable for thick paper. Even when the skeleton type cylinder is used, the thin paper sheet can be smoothly transferred, and the occurrence of printing failure is avoided.

[0071]

As described above, according to the present invention, the guide for printing is formed between the outer circumference of the printing cylinder and the sheet guide for guiding the sheet along the outer circumference of the printing cylinder. By passing air through the gap and ejecting air into the guide gap to allow the sheet to float and pass through by the Bernoulli effect, flutter at the sheet end at the downstream portion of the guide gap in the sheet transfer direction and paper Provided is a sheet guide device for a sheet-fed printing press which can prevent the occurrence of rash and can stably transfer thin paper sheets, and can smoothly transfer thin paper sheets using a skeleton type cylinder suitable for thick paper. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part near a sheet guide unit in a sheet guide device of a sheet-fed printing press according to a first embodiment of the present invention.

FIG. 2 is a view taken in the direction of the arrow A in FIG. 1;

FIG. 3 is a view corresponding to FIG. 1, showing a second embodiment of the present invention.

FIG. 4 is a view corresponding to FIG. 2, showing a third embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 2, showing a fourth embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 2, showing a fifth embodiment of the present invention.

FIG. 7 is a sectional view taken along the line BB of FIG. 6;

FIG. 8 is a view corresponding to FIG. 1, showing a sixth embodiment.

FIG. 9 is a configuration diagram of a sheet-fed printing press to which the present invention is applied.

FIG. 10 is a front sectional view showing a configuration around a skeleton-type intermediate cylinder and a sheet guide device installed along the outer periphery thereof according to a conventional technique.

11 (A) is a view taken in the direction of arrow AA in FIG. 10, and FIG.
Indicates the surface configuration of the sheet guide surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet guide 1d Surface of sheet guide 2 Air supply chamber 3 Suction chamber 4 Air outlet 5 Air suction pipe 6 Air supply pipe 6a, 6b, 6c Air supply pipe 7 Air suction pump 8 Air suction hole 9 Air supply pump 10 Claw 11 Seat 13 Air circulation pump 013 Air circulation path 15 Guide gap 16 Switching valve 18a, 18b Open / close valve 19 Hood 21 Space 22, 28 Air suction hole 25 Partition wall 23a ... Impression cylinder 27 Intermediate cylinder (skeleton intermediate cylinder)

Claims (10)

[Claims] 1. A first printing cylinder such as an intermediate cylinder or a paper discharge cylinder having an arcuate sheet guide surface formed on a lower peripheral surface thereof with a guide gap therebetween, and a first printing cylinder and a sheet transfer section. In a sheet-fed printing press provided with an impression cylinder and other second printing cylinders arranged in close proximity to each other, one or a plurality of air supply chambers are provided at a rear portion of the arcuate sheet guide surface on the upstream side in the sheet transfer direction. An air suction chamber is provided at a rear portion on the downstream side in the sheet transfer direction adjacent to the air supply chamber, and the air stored in the air supply chamber is blown out from an air outlet provided on the upstream sheet guide, thereby discharging the sheet. First air flow control means for floating in the guide gap and passing it downstream of the sheet guide; and a plurality of first air suction openings on the downstream sheet guide surface on the downstream side of the sheet guide. A second air flow control means for sucking air from the group of holes into the air suction chamber and discharging the air sucked into the suction chamber to the outside of the chamber from a chamber wall surface different from the sheet guide surface. Sheet guide device for sheet-fed printing press. 2. The sheet-fed printing press according to claim 1, wherein a plurality of ventilation portions such as stepped notches for passing a sheet gripping claw provided on a printing cylinder are formed at a downstream end of the sheet guide surface. In the sheet guide device, air flowing through the ventilation portion is sucked through a space (hereinafter, referred to as a lower space) facing a second printing cylinder peripheral surface below a downstream end of the sheet guide surface, 2. The sheet guide device for a sheet-fed printing press according to claim 1, wherein the air suction unit is configured to be able to discharge the air sucked into the suction chamber through the air suction hole from the air discharge unit. 3. A part of the discharged air discharged to the outside of the air suction chamber is returned to the suction chamber, and the air is sucked into the air suction chamber through a plurality of first air suction holes opened on a downstream sheet guide surface. A sheet guide device for a sheet-fed printing press, comprising means for adjusting the amount of air suction to be performed. 4. The discharge path of the second air flow control means,
2. The single wafer according to claim 1, comprising an air circulation path that connects the air suction chamber and the air supply chamber, and configured to be able to circulate through a circulation pump provided in the air circulation path. Sheet guide device for printing press. 5. The air suction chamber is configured to return a part of the discharge air flow of the circulation pump to the air suction chamber side, and a plurality of first air suction holes opening to a downstream sheet guide surface. 2. A sheet guide device for a sheet-fed printing press according to claim 1, wherein the amount of air sucked into the sheet feeding device is adjustable. 6. The first air suction hole group formed on the sheet guide surface advances to both ends in the sheet width direction from the row of air suction holes located at the center portion side in the sheet guide surface width direction. 2. The sheet guide device of a sheet-fed printing press according to claim 1, wherein the sheet guide device is arranged with a phase in the width direction toward an upstream side or a downstream side in a sheet-sending direction. 7. A suction / discharge control unit which divides the air suction chamber into a plurality of parts by a partition wall in a width direction of the sheet guide, and controls a suction amount to be variable or openable / closable for each of the divided suction chambers. The sheet guide device for a sheet-fed printing press according to claim 1, further comprising: 8. The sheet guide device for a sheet-fed printing press according to claim 2, wherein a plurality of ventilation portions such as stepped notches are formed at a downstream end of the sheet guide surface. A second air suction hole to be sucked is provided on a suction chamber wall surface facing the peripheral surface of the second printing cylinder, and can be discharged from the air discharge section together with the air sucked into the suction chamber through the first air suction hole. A sheet guide device for a sheet-fed printing press, characterized in that: 9. The sheet guide device for a sheet-fed printing press according to claim 2, wherein a plurality of ventilation portions such as stepped notches are formed at a downstream end of the sheet guide surface. A hood portion is provided adjacent to the downstream side wall surface of the suction chamber facing the suction chamber, and the hood portion is opened to the rotation peripheral surface of the second printing cylinder below the sheet guide end, and communicates with the hood portion on the downstream side wall surface of the suction chamber. A third air suction hole is opened, the suction outlet is provided on the bottom surface of the hood portion, and the air in the suction chamber can be discharged from the hood portion through the third air suction hole together with the ventilation portion. A sheet guide device for a sheet-fed printing press, comprising: 10. The single wafer according to claim 9, wherein the air in the hood member can be returned to the suction chamber together with the air supply chamber via a pump provided on a discharge circulation path. Sheet guide device for printing press.