JP2589345Y2 - Paper guide device for sheet-fed rotary printing press with reversing mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is provided in a sheet-fed rotary printing press with a reversing mechanism which enables single-sided printing and double-sided printing with a single unit. The present invention relates to a paper guide device for guiding conveyed paper.

[0002]

2. Description of the Related Art With the diversification of printing, various sheet-fed rotary printing presses equipped with a reversing mechanism, which can perform single-sided printing and double-sided printing with one machine, have been proposed and put into practical use. As an example, Japanese Patent Application Laid-Open No. 1-108044 discloses a double-diameter reversing cylinder provided between a double-diameter pressure cylinder on the upstream side and a double-diameter pressure cylinder on the downstream side. explain.

FIG. 13 is a cylinder arrangement diagram of a sheet-fed rotary printing press with a reversing mechanism disclosed in this publication, wherein adjacent printing units, for example, a first printing unit 1 and a second printing unit 2, A plate cylinder 3 on which a printing plate is mounted and a blanket cylinder 4 on which a blanket is wound are provided in contact with each other, and the blanket cylinder 4 of the printing unit 1 is an upstream cylinder in the paper transport direction. A double diameter impression cylinder 5 is provided in contact with the impression cylinder 5. The blanket cylinder 5 of the printing unit 2 is provided with a double-diameter impression cylinder 6 which is a cylinder on the downstream side with respect to the paper conveyance direction, and is provided between the impression cylinder 5 and the impression cylinder 6. A reversing cylinder 7 of a diameter is provided in contact with both impression cylinders 5 and 6.

A plurality of gripper devices 8 each composed of a claw and a claw base are provided at a position where the outer peripheral portion of the impression cylinder 5 is equally divided in the circumferential direction.
(Hereinafter, such a holding claw device is simply referred to as a claw) is provided in parallel in the axial direction of the impression cylinder 5, and is provided at a position where the outer peripheral portion of the impression cylinder 6 is equally divided into two in the circumferential direction. , Nail 9
It is provided in parallel in the axial direction of the impression cylinder 6.

[0005] Further, the outer peripheral portion of the reversing cylinder 7 is moved in the circumferential direction by two.
Claws 10 are provided in parallel with each other in the axial direction of the reversing cylinder 7 at positions where the claw 10 is equally divided, and the positions of these claws 10 are set so as to correspond to the claws 8 and 9 by rotation of the trunk group. Have been. In addition, a plurality of suction ports 11 connected to a suction air source such as a blower (not shown) are provided near each claw 10 at a position where the outer peripheral portion of the reversing cylinder 7 is divided into two equal parts in the circumferential direction. I have.

With this configuration, in the case of single-sided printing, when the group of cylinders such as the cylinders 5, 6, 7 and the like rotate, the claws 8 are formed.
The paper 12 conveyed in addition is subjected to the first color printing when passing between the blanket cylinder 4 and the impression cylinder 5, and the paper 12 is changed from the claw 8 to the claw 10 and turned over. It is conveyed while being wound on the lower peripheral surface of the body 7. The wrapped paper 12 is conveyed by being changed from the claw 10 to the claw 9, and when the paper 12 passes between the blanket cylinder 4 and the impression cylinder 6, the second color printing is performed on the same surface as before. .

When switching from single-sided printing to double-sided printing, the phase of the upstream cylinder group including the impression cylinder 5 is adjusted so that the paper buttocks of the paper 12 held by the claws 8 correspond to the suction openings 11. Thereafter, when printing is started and the cylinder group such as the cylinders 5, 6, 7 and the like rotates, the paper 12 conveyed in addition to the claws 8 is transported when passing between the blanket cylinder 4 and the impression cylinder 5. The paper 12 is printed on the front surface, and the paper 12 passes through the pair of contacts of the two cylinders 7 and 8 without being gripped by the claws 10 and is wound around the lower peripheral surface of the impression cylinder 5.

When the paper butt of the wound paper 12 reaches the point of contact between the two cylinders 7 and 8, the paper butt is sucked by the suction port 11 and conveyed, and at the same time, the gripping end is moved from the grip of the claw 8. To be released. The paper 12 sucked into the suction port 11 is turned over by being replaced by the claw 10 and conveyed, is turned over from the claw 10 to the claw 9, and is conveyed by the impression cylinder 6. The transferred paper 12 includes a blanket cylinder 4 and an impression cylinder 6.
Is printed on the back side when passing between the two sides, and double-sided printing is performed.

In the conventional sheet-fed rotary printing press equipped with a reversing mechanism, an air blower 13 connected to an air source (not shown) is provided at a pair of contact points between the impression cylinder 5 and the reversal cylinder 7 with air ejection holes. The paper 12 is provided on the upstream side of the contact point in the paper transport direction with the paper 12 in close proximity, and is configured so that the paper 12 is pressed against the peripheral surface of the impression cylinder 5 by air ejected from the air ejection holes.

[0010]

However, in the paper guide device provided in such a conventional sheet-fed rotary printing press with a reversing mechanism, in the case of the double-sided printing, the paper 12 has a claw 8.
In addition, when the paper 12 is wound around the lower peripheral surface of the impression cylinder 5, the paper 12 that has passed the pair of contacts of the two cylinders 5 and 7 may not adhere to the peripheral surface of the impression cylinder 5. Torso 7 from claw 8
There is a problem that accurate delivery of the paper butt to the nail 10 cannot be expected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a paper guide device for a sheet-fed rotary printing press with a reversing mechanism capable of accurately transferring paper between printing cylinders. It is an object.

[0012]

In order to achieve the above object, in the present invention, a paper transport cylinder is disposed between an upstream cylinder and a downstream cylinder with their circumferential surfaces opposed to each other. In addition, sheet-fed rotary printing with a reversing mechanism provided with a reversing mechanism that holds the paper end of the paper wrapped around the upstream cylinder while holding the gripping end and reverses the paper while transferring the paper to the downstream cylinder. On the machine,
A first air blowing device that is disposed upstream of the point of contact between the upstream cylinder and the paper transport cylinder in the paper transport direction and blows air on the surface of the paper conveyed while being in contact with the peripheral surface of the upstream cylinder; A second air blowing device that is disposed downstream of the point of contact between the upstream cylinder and the paper transport cylinder in the paper transport direction and blows air on the surface of paper conveyed in contact with the upstream cylinder; and An air supply connection / disconnection device for connecting / disconnecting supply of air to the second air blowing device is provided.

[0013]

In the case of double-sided printing, the gripping edge of the paper held and transported by the claws of the upstream cylinder passes through a pair of contacts between the cylinder and the paper transport cylinder, and the paper is placed under the upstream cylinder. Wound around the side surface. As a result of the winding, the paper butt that has reached the contact point of the two cylinders is delivered to the paper transport cylinder, wound around the paper transport cylinder while being turned upside down by the reversing mechanism, and then delivered to the downstream cylinder and the reverse side Is printed.

In the transport and delivery of such paper, air is blown on both the upstream and downstream sides of the pair of contacts of the two cylinders, so that the paper conveyed in contact with the upstream cylinder is blown. It closely adheres to the peripheral surface of the cylinder on the upstream side, and the paper is transported and delivered reliably. When transporting and delivering paper,
Since the air supply / disconnection means is operated and the supply of air to the second air blowing device is disconnected and connected at a predetermined timing, the delivery of the paper is performed accurately.

[0015]

1 to 12 show an embodiment of a paper guide device of a sheet-fed rotary printing press with a reversing mechanism according to the present invention. FIG. 1 shows a sheet-fed rotary printing machine with a multicolor printing reversing mechanism embodying the present invention. FIG. 2 is a plan view of a first air blowing device and a second air blowing device, FIG. 3 is a longitudinal sectional view of an air supply connecting / disconnecting device, FIG. 4 is a front view of the air supply connecting / disconnecting device, 5 is a sectional view taken along line VV of FIG. 3, FIG. 6 is a sectional view taken along line VI-VI of FIG. 3, and FIG.
VII sectional view, FIG. 8 is an enlarged side view of the impression cylinder and the reversing cylinder embodying the present invention, and FIGS. 9, 10, 11, and 12 are cylinders shown to explain the paper transport operation during duplex printing. FIG.

In FIG. 1, each printing unit 21,
A plate cylinder 24 and a blanket cylinder 25 are provided in contact with the cylinders 2 and 23, and under the blanket cylinders 25, double-diameter pressure cylinders 26, 27 and 28 as printing cylinders are respectively provided on the peripheral surface. Are provided in contact with each other.

Between the impression cylinder 26 as an upstream cylinder in the paper transport direction and the impression cylinder 27 also as a downstream cylinder, a double-diameter transfer cylinder 29 as a paper transport cylinder has a circumferential surface. It is provided in contact with these two trunks 26 and 27, and
A reversing cylinder 30 serving as a paper transport cylinder is provided between an impression cylinder 27 serving as an upstream cylinder with respect to the reversing cylinder 30 and an impression cylinder 28 also serving as a downstream cylinder.
It is provided in contact with.

At the place where the outer peripheral portions of the impression cylinder 26, the transfer cylinder 29, the impression cylinder 27, and the impression cylinder 28 are equally divided in the circumferential direction, a plurality of gripping claw devices (hereinafter, referred to as claw and claw base) are provided. Such a holding nail device is simply called a nail) 31, 32, 3
3, 34 are provided respectively.

Further, the outer peripheral portion of the reversing cylinder 30 is moved in the circumferential direction by 2 degrees.
A plurality of claws 35 are provided at the equally-divided portions, and a portion between the outer circumferential portion of the reversing cylinder 30 and the blower (not shown) will be described later at a portion where the outer peripheral portion is equally divided in the circumferential direction. A plurality of suction ports 36 each connected by a hose via an air supply connection / disconnection device are provided at positions delayed from the claws 35 by a predetermined angle with respect to the rotation direction of the reversing cylinder 30.

In the case of double-sided printing, in FIG. 11 for explaining the reversing operation, the paper 4 held by the claws 33 of the impression cylinder 27 is shown.
The phases of the upstream cylinders 27, 29, and 26 including the impression cylinder 27 are adjusted so that the suction port 36 corresponds to the paper bottom of 0, and in the case of single-sided printing, the claws 33 of the impression cylinder 27 Reversing cylinder 30
The phases of the upstream cylinders 27, 29, 26 including the impression cylinder 27 are adjusted to correspond to the claws 35.

With this configuration, in the case of double-sided printing, the paper 40 to be conveyed by being changed from the nail 31 to the nail 32 and further to the nail 33 is sucked by the suction port 36 at the tail of the paper. Although the paper is conveyed while being turned upside down, the present apparatus is provided with an air blowing device that blows air onto the paper 40 that is conveyed in contact with the peripheral surface of the impression cylinder 27.

That is, a first air blowing device shown in a plan view in FIG. 2 is provided at a position which is located on the upstream side of the contact point between the impression cylinder 27 and the reversing cylinder 30 in the paper transport direction and is close to the contact point. The air blowing pipe 55 is supported between the left and right frames 41. The air blowing pipe 55 has an air blowing direction toward the center of the impression cylinder 27 and a tangent to the impression cylinder 27 as shown in FIG. A plurality of air blow holes 55 oriented in different directions
a, 55b are bored in parallel in the axial direction of the air blowing pipe 55, and are connected to the air supply side of a blower (not shown) via a hose 58.

By doing so, the impression cylinder 27 and the reversing cylinder 3
When the blower operates in a state where the paper 40 is conveyed by rotating each cylinder such as 0, the air blowing holes 55 of the air blowing pipe 55 are opened.
a and 55b, air is blown out and blown onto the paper 40,
The paper 40 is placed on the impression cylinder 27 before the point of contact between the two cylinders 27 and 30.
It is configured to be in close contact with the peripheral surface of.

An air blowing pipe 59 as a second air blowing device is supported between the left and right frames 41 at a position located on the downstream side of the contact point between the impression cylinder 27 and the reversing cylinder 30 in the paper transport direction. A plurality of air blowing nozzles 61 are mounted on the air blowing pipe 59 in parallel in the axial direction of the air blowing pipe 59. And these air blowing nozzles 61
As shown in FIG. 8, the air ejection direction is set to the tangential direction of the reversing cylinder 27 that connects the peripheral surfaces of the reversing cylinder 30 on the contact side with the two cylinders 27 and 30 and the nozzle tube 59.

Further, near the air blowing pipe 59, an air blowing pipe 60 is provided between the left and right frames 41.
9, and a plurality of air blowing nozzles 63 are mounted on the air blowing tube 60 in parallel in the axial direction of the air blowing tube 60. As shown in FIG. 8, the air blowing direction of these air blowing nozzles 63 is set to the tangential direction of the reversing cylinder 30 connecting the peripheral surfaces of the reversing cylinder 27 opposite to the contact between the two cylinders 27 and 30 and the air blowing pipe 59. Have been.

Here, the air blowing pipes 59 and 60 are provided with an air connecting / disconnecting device for connecting / disconnecting the supply of air. That is, in FIG. 3, a rolling bearing 43 is mounted on a bearing holder 42 fitted in a bearing hole 41 a of a frame 41 and bolted, with the movement in the axial direction restricted by a holding plate 44. The bearing 43 includes the reversing cylinder 30.
Is rotatably supported by a hollow end shaft 30a.

On the other hand, a bracket 45 fixed to the outer surface of the frame 41 is provided with a rotary valve as an air supply connection / disconnection device indicated by reference numeral 46, and a flange of an outer cylinder 47 formed in a cylindrical shape is bolted. The rotary valve 46 is fixed to and supported by the outer cylinder 47.
An inner cylinder 49 fitted and fixed to the outer cylinder 47;
The end shaft 30 is rotatably supported via the inner cylinder 49.
The end shaft 30a is constituted by an end shaft 30a and a rotary shaft 51 which is bolted concentrically.

Numeral 52 denotes a nipple screwed into a screw hole 47a of the outer cylinder 47. The nipple is connected to a suction side of a blower (not shown) by a hose 53.
As shown in FIG. Inner cylinder 4
9 is provided with a long hole 49a and a long hole 49b penetrating the inner circumference and the outer circumference thereof.
b is obtained by the rotation of the rotating shaft 51 integrated with the reversing cylinder 30.
L-shaped holes 51a and 51b provided in the rotation shaft 51,
A hose 54 penetrating through the inner hole 30b of the reversing cylinder 30 is configured to communicate with the suction port 36 at a predetermined timing.

Reference numeral 56 denotes a nipple screwed into a screw hole 47b of the outer cylinder 47, which is connected to an air supply side of a blower (not shown) by a hose 57. The screw hole 47b is formed as shown in FIG. An opening is formed on the peripheral surface of the inner cylinder 49. Inner cylinder 49
Is provided with a long hole 49c that penetrates the inner circumference and the outer circumference thereof, and the long hole 49c passes through the rotary shaft 51 in the diametrical direction by rotation of the rotary shaft 51 integrated with the reversing cylinder 30. The hole 51 c and the hose 64 are configured to communicate with the air blowing tube 60 at a predetermined timing.

By doing so, the impression cylinder 27 and the reversing cylinder 3
When the blower is operated in a state where each of the cylinders such as 0 is rotating and the paper 40 is being conveyed, the air blowing nozzle 6 of the air blowing pipe 60 is operated.
Air is ejected from 3 and blown onto the paper 40, so that the holding end side of the paper 40 in the state shown in FIG. 8 is brought into close contact with the peripheral surface of the impression cylinder 27.

The long hole 49c is connected to the air blowing pipe 59 by a hole 51d and a hose 62, and the paper cylinder 40 such as the impression cylinder 27 and the reversing cylinder 30 is rotated to convey the paper 40. When the blower operates in this state, air is blown out from the air blowing nozzle 61 on the air blowing pipe 59, and the two bodies 27 and 30 are blown.
The paper 40 is configured to be brought into close contact with the peripheral surface of the impression cylinder 27 at a position near the downstream side in the paper transport direction with respect to the pair of contact points.

The operation of the sheet-fed rotary printing press with the reversing mechanism configured as described above will be described. In the case of double-sided printing shown in the figure, when the printing operation is started and each of the cylinders 27, 28, 29, 30, etc. is rotated, the paper 40 whose edge is held by the claws 33 of the impression cylinder 27 is rotated by the rotation of the impression cylinder 27. And is brought into contact with the upper peripheral surface of the impression cylinder 27, and the blanket cylinder 25 and the impression cylinder 27.
The printing is performed on the surface when passing between the two.

When the pawl 33 reaches the point of contact between the impression cylinder 27 and the reversing cylinder 30, no gripping is performed, and the pawl 33 passes through the point of contact between the two cylinders 27 and 30 while holding the paper 40. Is attached to the lower peripheral surface of the impression cylinder 27. During the conveyance of the paper 40, air flows from the air blowing holes 55 a and 55 b of the air blowing pipe 55 disposed on the upstream side of the contact point between the two cylinders 27 and 30 in the paper conveyance direction in the radial direction and the tangential direction of the impression cylinder 27. Spouted into paper 40
, The paper 40 comes into close contact with the peripheral surface of the impression cylinder 27. FIG. 9 shows a state in which the central portion of the paper 40 held by the claws 33 has reached the point of contact between the two cylinders 27 and 30, and the next half of the subsequent paper 40A has the front half of the peripheral surface of the impression cylinder 27. Is attached to

From this state, each cylinder 27, 28, 29, 30
As shown in FIG. 10, the paper buttocks of the paper 40 held by the claws 33 reach the front of the two cylinders 27 and 30, and are conveyed while being wound around the lower peripheral surface of the reversing cylinder 30. When the rear end of the previous paper 40B passes over the air blowing nozzle 61, the long hole 49c of the rotary valve 46 passes through the hole 51d, and air is supplied to the air blowing pipe 59 via the hose 62, and the air blowing nozzle 61 Is blown toward the tangential direction of the reversing cylinder 30 connecting the contact points of the two cylinders 27 and 30 and the nozzle tube 59, the paper 40 adheres closely to the peripheral surface of the impression cylinder 27, and the previous paper 40B is The paper is conveyed in a stable state without causing paper splatter or the like.

The elongated hole 49a of the rotary valve 46 is slightly delayed from the start of air blowing from the air blowing nozzle 61.
1a, and the suction air of the blower acts on the suction port 36 via the hose 54, so that the suction port 36 can be sucked.

When each cylinder is further rotated, and as shown in FIG. 11, when the paper edge of the paper 40 held by the claws 33 reaches the pair of contacts of the two bodies 27 and 30 and corresponds to the suction port 36, the paper edge of the paper 40 Is sucked into the suction port 36, and at the same time, the claw 33 opens and
You are released from your mouth.

At this time, since the long hole 49c of the rotary valve 46 does not communicate with the hole 51d, the air blowing from the air blowing nozzle 61 to the paper 40 is stopped, and at the same time, the hole 51c of the rotating shaft 51 connects the hose 64 to the hole 51c. Through the long hole 49c
And the air blowing pipe 59 and the long hole 49c and the air blowing pipe 60 continuously, so that the paper 40 wound around the lower peripheral surface of the impression cylinder 27 is moved from the air blowing nozzle 63 to the reversing cylinder 30. The air blown toward the tangential direction of the reversing cylinder 30 that connects the peripheral surface of the two cylinders 27 and 30 opposite to the contact point and the air blowing pipe 59 is blown, and the paper 40 adheres closely to the peripheral surface of the impression cylinder 27.

The gripping end of the paper 40 sucked into the suction port 36 is replaced with a claw 35 and, as shown in FIG. Conveyed. The claw 35 and the claw 34 open and close when the gripping end of the conveyed paper 40 reaches the pair of contacts of the two bodies 30 and 28, so that the paper 40 is conveyed while being held by the claw 34,
When the paper passes between the blanket cylinder 25 and the impression cylinder 28, printing is performed on the back surface to form double-sided printing.

In this embodiment, an example in which the reversing mechanism is applied to the impression cylinder and the reversing cylinder is shown. However, the reversing mechanism may be applied to the front and rear transfer cylinders or the transfer cylinder and the impression cylinder.

In this embodiment, an example in which the reversing mechanism is constituted by a mouth and a gripper is shown. However, the present invention is not limited to this. For example, in addition to the gripper, a needle which pierces the mouth or the bottom of the paper may be used. It is also possible to use a paper butt holding means to hold, reverse, and deliver paper to the downstream drum only with the paper butt holding means instead of passing the paper from the paper butt holding means to the holding claws. You may comprise.

Further, in this embodiment, an example is shown in which the air supply connection / disconnection device for connecting / disconnecting the air supply is provided only to the second air blowing device, but this is also provided for the first air blowing device. The air blowing may be performed in a timely manner.

In this embodiment, the second air blowing device attached to the downstream cylinder is configured to blow air only in the tangential direction of the impression cylinder 27. Is not limited to the tangential direction of the impression cylinder 27,
Air is blown directly to the contact point between the impression cylinder 27 and the reversing cylinder 30 or air is blown into the inside of the cylinder to create a paper 40 by negative pressure.
May be brought into close contact with the peripheral surface of the body to ensure the delivery of the paper butt.

Further, in this embodiment, a rotary valve has been exemplified as the air supply / disconnection means. However, the invention is not limited to such a means for mechanically connecting and disconnecting air. Activate this solenoid valve by the signal,
You may make it connect and disconnect the supply of air.

In this embodiment, the second air blowing device is only the air blowing pipe 59 for blowing air in the direction of the contact between the two bodies 27, 30. However, the second air blowing device is on the opposite side of the contact between the two bodies 27, 30. The second air blowing device may include the air blowing tube 60 that blows air. The air blowing by the air blowing tube 60 does not need to take a timing, and may be continuously performed.

[0045]

As is apparent from the above description, according to the present invention, the gripping end is provided on the paper transport cylinder disposed with the peripheral surfaces thereof opposed to each other between the upstream and downstream cylinders. In a sheet-fed rotary printing press with a reversing mechanism provided with a reversing mechanism for holding the paper butt of the paper wound around the upstream cylinder and transferring the paper to the downstream cylinder while reversing the paper, A first air blowing device that is disposed upstream of a contact point between the cylinder and the paper transport cylinder in the paper transport direction and that blows air on a surface of paper conveyed while being in contact with a peripheral surface of the upstream cylinder; A second air blowing device that is disposed in the vicinity of a pair of contact points of the cylinder and the paper transport cylinder and that is disposed on the downstream side in the paper transport direction and blows air on the surface of the paper conveyed in contact with the upstream cylinder; By providing an air supply connection / disconnection device for connecting / disconnecting the supply of air to the second air blowing device, Air is blown not only on the upstream side of the contact point between the paper transport cylinder and the upstream cylinder, but also on the downstream side of the contact point on the paper wound around the flow-side cylinder. Since the paper affixed to the cylinder and conveyed is sufficiently adhered to the peripheral surface of the upstream cylinder, it is possible to reliably transfer the paper between the cylinder on the upstream side of the paper conveyance cylinder and the paper conveyance cylinder. The quality of printed matter is improved.

[Brief description of the drawings]

FIG. 1 is a cylinder arrangement diagram of a sheet-fed rotary printing press with a four-color printing reversing mechanism embodying the present invention.

FIG. 2 is a plan view of a first air blowing device and a second air blowing device.

FIG. 3 is a vertical sectional view of the air supply connecting / disconnecting device.

FIG. 4 is a front view of the air supply connection / disconnection device.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 3;

FIG. 8 is an enlarged side view of the impression cylinder and the reversing cylinder embodying the present invention.

FIG. 9 is a drum arrangement diagram for explaining a paper conveying operation.

FIG. 10 is a cylinder arrangement diagram for explaining a paper transport operation.

FIG. 11 is a drum arrangement diagram for explaining a paper transport operation.

FIG. 12 is a drum arrangement diagram for explaining a paper transport operation.

FIG. 13 is a cylinder arrangement diagram of a conventional sheet-fed rotary printing press with a reversing mechanism.

[Explanation of symbols]

 26 Impression Cylinder 27 Impression Cylinder 28 Impression Cylinder 30 Reversing Cylinder 31 Claw 32 Claw 33 Claw 34 Claw 35 Claw 36 Suction 40 Paper 46 Air Supply Connecting / Disconnecting Device 49 Inner Cylinder 49a Long Hole 49b Long Hole 49c Long Hole 51 Rotating Shaft 51a Hole 51b Hole 51c Hole 52 Nipple 53 Hose 54 Hose 55 Air blow pipe 55a Air blow hole 55b Air blow hole 57 Hose 58 Hose 59 Air blow pipe 60 Air blow pipe 61 Air blow nozzle 62 Hose 63 Air blow nozzle 64 Hose

Claims (1)

(57) [Scope of request for utility model registration] 1. A paper feed cylinder provided with a peripheral surface in contact with an upstream cylinder and a downstream cylinder with respect to a paper transport direction and having a gripping end held therein and having an upstream end. In a sheet-fed rotary printing press with a reversing mechanism, comprising a reversing mechanism for transferring the paper to the downstream cylinder while holding the paper butt of the paper wound on the cylinder and reversing the paper, the upstream cylinder and the A first air blowing device that is disposed upstream of a contact point with the paper transport cylinder in the paper transport direction and blows air on a surface of paper conveyed while being in contact with a peripheral surface of the upstream cylinder; A second air blowing device which is disposed downstream of the point of contact between the drum and the paper transport cylinder in the paper transport direction and blows air onto the surface of the paper conveyed in contact with the upstream drum; and An air supply disconnecting device for disconnecting and supplying air to the air blowing device with a reversing mechanism Paper guide device for sheet-fed rotary printing press.