JP2003326674A - Intermediate cylinder for sheet-feed press, and sheet- feed press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intermediate cylinder for a sheet-feed press and a sheet-feed press, in which setting of a device can be readily changed even if the size of paper sheet is changed, the flapping of sheets can be suppressed and occurrence of poor drying, or stains or damages or the like to a printing surface can be prevented. <P>SOLUTION: An intermediate cylinder for transferring the sheets in the sheet- feed press is equipped with a plurality of suction boxes 15a, 15b formed by being disposed at rotating positions of the cylinder body inner part different from each other, a plurality of induction ports 16 formed at respective suction boxes 15a, 15b so as to open at the cylinder main body outer surface, a suction power applying means 10 for applying suction force to the suction boxes 15a, 15b, and a switching means 7 for selectively switching connection between the plurality of suction boxes 15a, 15b and the suction force applying means 10. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-fed printing press, which is installed after a printing device section, regulates a traveling posture of a sheet transferred from a preceding process printing device, etc., and stably transfers the sheet. The present invention relates to an intermediate cylinder for a printing press and a sheet-fed printing press having such an intermediate cylinder.

[0002]

2. Description of the Related Art In recent years, various types of double-sided printing machines for printing on both front and back sides have been proposed and put into practical use. The double-sided printing machine illustrated in FIG. 9 exemplifies a printing apparatus of a type that prints one color on both front and back surfaces of the sheet 4. In this printing machine, a set of back surface printing device 1 is arranged below the upstream side of the sheet traveling route, and a set of front surface printing device 2 is arranged above the downstream side of the sheet traveling route.

In addition, two sets of intermediate drums 3 are provided between the sheet feeding device 19, the feeder board portion 20, the back side printing device 1 and the front side printing device 2 and sequentially transfer the sheets to the downstream side.
It is composed of a, 3b, a paper discharge device 21 and the like.
The sheet discharging device 21 includes a sheet conveying device 22 and a sheet stacking device 23 provided below the downstream end of the sheet conveying device.

The sheet feeding device 19 stacks the sheets 4 to be printed on the sheet feeding table 30, and one sheet from the uppermost sheet 4 corresponding to the consumption speed (mechanical speed) associated with printing. It is a device that supplies each one by one. The feeder board unit 20 functions to transfer the sheets 4 sequentially fed from the sheet feeding device 19 to the first intermediate cylinder 24 arranged at the introduction portion of the back surface printing apparatus 1.

The above-mentioned seat 4 is provided from the first intermediate cylinder 24 to the second intermediate cylinder 24.
The intermediate cylinder 25 is transferred to the impression cylinder 5a of the back surface printing apparatus 1 and printed. Subsequently, after being conveyed via the intermediate cylinders 3a and 3b in sequence, the impression cylinder 5 of the surface printing apparatus 2 located downstream.
It is transferred to b and the surface is printed. Printer 2
(Or 1) is a plate cylinder 34 around which an ink reservoir 31, an ink roller group 32, and a printing plate 33 are wound, a blanket cylinder 35, as shown in FIG.
It is composed of an impression cylinder 5, a dampening water device 36, etc., and the ink 18 supplied to the ink reservoir 31 is appropriately kneaded in the process of sequentially transferring the ink roller group 32, and transferred to the surface of the printing plate 33 as an ink film. After being supplied, it is further transferred as a pattern to the outer peripheral surface of the blanket cylinder 35 on the downstream side.

At the same time, dampening water is also supplied from the dampening water device 36. After that, it is transferred to the surface of the sheet 4 which runs between the blanket cylinder 35 and the impression cylinder 5, and the predetermined printing is completed. Here, an example in which one back printing device 1 and one front printing device 2 are provided is shown, but a plurality of sets of back printing devices 1 having different ink colors along the sheet traveling direction are shown.
There is also a printing machine for performing multicolor printing by arranging the front surface printing devices 2 side by side. In any case, the number of installed printing apparatuses 1 and 2 is appropriately selected.

The sheet 4 which has been printed as described above is provided with a chain from the impression cylinder 5b of the final printing device 2 to the sheet conveying device 22 of the paper discharging device 21, that is, the endless chain 28 driven by the paper discharging shaft 27. The gripper grips and conveys the sheet onto the sheet stacking device 23, and stacks the sheet on the sheet discharge table 29 of the sheet stacking device 23. Then, when they are stacked by a predetermined amount, they are carried out to the outside.

The ink 18 on the printing surface of the sheet is printed on the outer peripheral surface of the intermediate drum 3b after printing on the back surface, and by the gripper of the endless chain 28 which runs around the discharge shaft 27 from the impression cylinder 5b after printing on the front surface. While being gripped and conveyed, it is dried by the drying device 17. As an ink used for printing in a sheet-fed printing press, an ink that is dried and cured in response to UV (ultraviolet rays) is often used. Therefore, a UV drying device that irradiates ultraviolet rays is often installed. But,
It is desirable to equip a drying device corresponding to various characteristics of the used ink.

[0009]

The conventional sheet-fed printing press has the following problems.
Although configured as described above, in the intermediate cylinder 3b that transfers the sheet 4 to the front surface printing apparatus 2 after printing is completed by the back surface printing apparatus 1, the effect of the drying device 17 does not sufficiently function, and the drying is performed. There are problems such as causing drying defects such as unevenness and causing stains or scratches on the printed surface.

Further, Japanese Utility Model Publication No. 2-5951 discloses a paper feed cylinder that sucks a sheet and sends the sheet to various cylinders on the downstream side. This paper feed cylinder is provided with an air tank provided at the end of the cylinder, a plurality of suction ducts connected to the air tank in communication with each other, extending in the cylinder axial direction, and provided with phase shifts in the circumferential direction. Each suction duct is provided with a suction hole formed in the circumferential surface, and by operating an external intake device connected to the air tank, it is possible to suck a sheet by the suction hole. Has become.

In this paper feed cylinder, a shutter plate is inserted between the air tank and the suction duct. Multiple shutter plates are prepared in advance,
Each shutter plate has a through hole corresponding to a different suction duct. Then, by selecting and using an appropriate one from the shutter plates, a predetermined suction duct is selectively used as an air tank from a plurality of suction ducts that are provided with their phases shifted in the circumferential direction. The sheets can be communicated with each other, and the trailing edge of the sheet can be adsorbed by a suction hole located at an appropriate position according to the size of the sheet.

However, in this technique, the shutter plate must be replaced every time the sheet size changes. The shutter plate is attached by inserting it into a predetermined portion of the paper feed cylinder and then fastening it with bolts, which requires a lot of time and labor for the replacement work.

An object of the present invention is to solve these problems. That is, the object of the present invention is that even if the size of the sheet is changed, the setting of the device can be easily changed, fluttering of the sheet is suppressed, and poor drying, stains or scratches on the printing surface occur. It is an object of the present invention to provide an intermediate cylinder for a sheet-fed printing press and a sheet-fed printing press that are capable of preventing the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of the occurrence of damage.

[0014]

One aspect of the present invention is an intermediate cylinder for conveying a sheet in a sheet-fed printing press, and a plurality of suction members formed at different rotational positions inside the main body of the cylinder. A box, a plurality of suction holes formed in each of the suction boxes so as to open on the surface of the trunk body, a suction force applying means for applying a suction force to the suction box, the suction box and the suction force applying means Is an intermediate cylinder for a sheet-fed printing press, which is configured to include a switching unit that selectively switches the connection with.

Another aspect of the present invention is a sheet-fed printing press including the intermediate cylinder for the sheet-fed printing press. As a result of the study on the invention of the present application, it was found that the above-mentioned problem is largely due to the following violent (flapping) of the sheet 4. (1) The sheet 4 is conveyed with its front end clamped by the pawl device 26 of the intermediate body 3, but as shown in FIG. The paper tail is free to move. Therefore, during conveyance, the trailing edge of the paper leaves the surface (outer peripheral surface) of the intermediate drum 3 due to the centrifugal force and gravity associated with the rotational transfer, causing fluttering (roughening of the sheet 4) and making the running posture unstable. (2) The drying device 1 is caused by the flapping of the sheet 4.
The effect of No. 7 does not function sufficiently, and there is a risk of causing poor drying such as uneven drying. (3) The trailing edge of the sheet 4 comes into contact with the drying device 17, causing stains and scratches on the printed surface. (4) Due to the above, the print quality is remarkably deteriorated, which may cause a large amount of waste paper.

As a means for suppressing the violence of the seat 4, it has been found effective to provide the suction box as a part of the intermediate cylinder as described above.
It has been found that the above problems can be significantly improved by producing a sheet-fed printing machine by combining an intermediate cylinder having such a function and a drying device. Further, it has been found that the above problem can be improved more effectively by providing air injection means on the intermediate cylinder. The air jetting means jets air so that the sheet transferred to the intermediate cylinder extends along the peripheral surface of the intermediate cylinder.

Further features of the present invention will be clarified in the embodiments of the invention and the drawings described below.

[0018]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The same parts as those described in the prior art are designated by the same reference numerals. Moreover, these drawings and description are for exemplifying the present invention and do not limit the scope of the present invention.
It goes without saying that other embodiments may belong to the scope of the present invention as long as they match the gist of the present invention.

Since the basic construction of the sheet-fed double-sided printing machine according to the present invention as a printing machine is the same as that of the sheet-fed double-sided printing machine in the above-mentioned prior art, duplicated description will be omitted. (A) First Embodiment FIGS. 1 to 4 schematically show a first embodiment of the present invention as a model. FIG. 1 is a schematic side view showing the overall structure of a sheet-fed printing press, FIG. 2 is a cross-sectional view showing the structure of an intermediate cylinder (suction cylinder), and FIG. 3 is an axial cross-sectional view. FIG. 4 shows an example of suction hole arrangement.

In this embodiment, the intermediate cylinder 3b of the four intermediate cylinders 3a to 3d for sheet-fed printing presses installed between the back surface printing apparatus 1 and the front surface printing apparatus 2 in FIG. Is provided, and the traveling sheet 4 is sucked and held on the outer peripheral surface of the intermediate body 3b to be stably transported. Specifically, FIG. 2 and FIG.
As shown in FIG. 1, the intermediate barrel 3b includes a cell (main body) 11, a rotary shaft 14 that integrally rotates the cell 11, and a suction shaft 1.
3 is included. Then, the suction box 1 having a suction function on a part of the outer peripheral surface of the main body 11
5, the suction box 15 sucks and holds the tail, that is, the rear portion of the traveling seat 4 on the outer peripheral surface thereof, so that the seat 4 is stably transferred as described above.

In this embodiment, as shown in FIGS. 2 and 3, the suction boxes 15 (15) are provided at two positions on the intermediate body 3b.
a, 15b) are provided. Suction box 1
5a and 15b are suction shafts 1 via connection pipes 6a and 6b, respectively.
3, an opening 7a or 7b of a switching valve (switching means) 7 that is connected to the intake holes 38a and 38b in the air cylinder 3 and moves axially by an air cylinder (actuator) 37 to switch the intake location.
Is connected to the suction pipe 9, the control valve 8 and the suction device (suction force applying means) 10 which is an air suction source via the suction pipe 9, and the suction operation or non-operation can be arbitrarily set. There is. As shown in FIG. 4, a plurality of air suction holes 16 are formed on the outer peripheral surfaces of the suction boxes 15a and 15b (the surfaces that form the outer peripheral surface of the body) so as to face the outer side of the body. When 10 is operated, the inside of the suction box 15 becomes a negative pressure, and the outside air can be sucked through these air suction holes 16. Therefore, the sheet 4 contacting the outer peripheral surface is conveyed in a sucked state and is sent to the next intermediate cylinder 3c. Therefore, the sheet 4 is dried by the drying device 17 and sent to the next intermediate cylinder 3c without any flapping.

Adsorption point, ie, suction box 15
In this case, two places are installed, but the present invention is not limited to this, and one or more places can be installed, and in the case of a plurality of places, they can be selectively selected depending on the sheet length. Further, the suction timing starts when the tail of the sheet 4 is transferred from the intermediate cylinder 3a to the intermediate cylinder 3b, and is released before the transfer from the intermediate cylinder 3b to the intermediate cylinder 3c.

However, such suction timing and the number of suction boxes are appropriately set according to various conditions, and it is stable suction to be determined by trial and error by conducting tests or simulations in advance. It is useful for obtaining performance. If the suction timing and the number of suction boxes are improper, the effect of preventing the sheet 4 from fluttering (fluttering) may be insufficient, but if the suction timing is set too wide or the number of suction boxes is too large, it becomes useless. It can result in aspirating air. In addition, the waste of equipment increases. At the same time, the amount of air to be sucked can be determined by trial and error.

FIG. 4 shows a suction hole 1 on the suction box surface.
An example of the arrangement pattern of No. 6 is shown. The number and shape of the suction holes 16 can be appropriately determined by a test or the like. As described above, according to the present invention, when the suction box is provided on the intermediate cylinder, it is possible to prevent the sheet 4 from sloping (fluttering). Can be prevented from being poorly dried, and stains and scratches that are likely to occur on the printed surface can be prevented.

Further, the suction box 15a,
15b is adapted to be selectively used, and the suction box 15a, 15b is switched between the air cylinder 3
The operation is performed by moving the switching valve 7 by the operation of 7. That is, in FIG. 3, when the drive shaft of the air cylinder 37 is in the retracted position A (the illustrated state), the suction port 38a formed in the suction shaft 13 has the switching port 7a.
The suction box 15a is connected to the suction device 10 via the switching valve 7 to be in the suction state in conformity with the opening 7a formed in the air cylinder 37, while the drive shaft of the air cylinder 37 is in the extended position B. In the state, the suction port 38b formed in the suction shaft 13 coincides with the opening 7b formed in the switching valve 7, and only the suction box 15b is connected to the suction device 10 via the switching valve 7 and the suction state is achieved. It is supposed to be.

For example, when the seat length is short, the suction box 15b is used, and when the seat length is long, the suction box 15a is used, so that the tail of the seat 4 can be stably sucked. The actuator for operating the switching valve 7 is not limited to the air cylinder, and various types such as an electric motor can be used. When an electric motor is used as the actuator, the switching valve 7 can be moved by using, for example, a pinion rack mechanism.

The suction start and release timings are determined by the suction port angle θ and its position in FIG. The position can be changed and set by holding the switching valve 7 so that the rotation can be adjusted. The openings 7a, 7b formed in the switching valve 7 are formed in an arc shape along the peripheral surface of the switching valve 7 as shown in FIG. Suction is carried out by the suction boxes 15a and 15b in a range where the suction ports 38a and 38b of the same coincide with each other. The above-mentioned suction port angle θ means these openings 7a, 7
It is the angle of the arc of b.

Further, as described above, by selectively using the suction boxes 15a and 15b according to the sheet length, there is an advantage that the sheet 4 can be stably adsorbed regardless of the sheet length. In addition, suction box 15
There is an advantage that switching between a and 15b can be easily and automatically performed only by controlling the operation of the air cylinder. In addition,
The form of the suction box is not limited to the above, and any known system can be adopted.

(B) Second Embodiment FIG. 5 is a view showing a second embodiment of the invention of the present application, and schematically shows a state in which the intermediate drum section according to the invention of the present application is installed in a sheet-fed printing press. It is a thing. In FIG. 5, in a double-sided printing machine configured to print one color on each side,
Impression cylinder 5a of back side printing apparatus 1 and impression cylinder 5b of front side printing apparatus 2
The intermediate cylinders of the present embodiment are installed on the intermediate cylinders 3b and 3d in between, and the drying device 17 is installed in close proximity to the intermediate cylinders. The basic printing functions (actions and effects) are the same as those described in the conventional art.

In FIG. 5, since the drying device 17 is arranged at two places and the corresponding two sets of intermediate drums 3b and 3d are constructed as suction intermediate drums, it is possible to suppress the fluttering of the sheet being dried. In addition to the function and effect described in regard to the first embodiment, the drying ability of the printing surface can be increased, so that the printing speed can be improved and the productivity can be improved. Further, if the diameter of the intermediate cylinder 3 corresponding to the drying device 17 is formed to be large, it is possible to increase the area of the sheet that can be simultaneously irradiated, and it is possible to further improve the drying function (efficiency).

(C) Third Embodiment FIGS. 6 to 8 are schematic views of a sheet-fed printing press according to a third embodiment of the present invention.

FIG. 6 is a schematic sectional view from a side view, FIG.
FIG. 8 is a schematic perspective view showing the intermediate cylinder and the air injection means by extracting, and FIG. 8 is a schematic side view of the intermediate cylinder for explaining a preferable range of the injection position of the air shower 50. As shown in FIG. 6, the sheet-fed printing machine according to the present embodiment is different from the sheet-fed printing machine according to the first embodiment described above in that it has an air shower (air ejection unit) 50 and an image sensor (for example, a CCD camera or an image pickup unit). , A detection device such as a COMS type or an infrared sensor) 60 is added.

The air shower 50 is provided with the air injection port 50a facing the intermediate body 3b, and the drying device 17 is provided opposite to the intermediate body 3b with the traveling line of the sheet 4 interposed therebetween. As shown in FIG. 7, the air shower 50 is provided with a plurality of the air injection ports 50a along the axial direction of the intermediate body 3b, and the air shower 50 is provided with an external air blower 53 via an air pipe 51. The air blower 53 can be operated to continuously inject air from the air injection port 50a over substantially the entire width of the intermediate barrel 3b. Of course, air may be jetted by the air shower 50 only when the seat 4 is located in the air jet region of the air shower 50.

Further, the air injection port 50a changes the mutual spacing and the injection port diameter of the air injection port 50a according to the axial direction of the intermediate cylinder 3b, that is, the position in the width direction of the seat 4, so that the strength of the air is increased. The sheet 4 becomes weaker from the center in the axial direction toward the end in the axial direction, so that the sheet 4 can be extended not only in the sheet flow direction but also in the sheet width direction. Of course, the mutual intervals and the diameters of the air injection ports 50a may be constant regardless of the position of the seat 4 in the width direction.

A pressure adjusting valve 52 is interposed in the air pipe 51, and the air injection pressure of the air blower 53 is adjusted by the pressure adjusting valve 52 to a predetermined pressure set according to the type of paper. It has become so. Further, reference numeral 70 in FIG. 7 is a rod-shaped sheet guide for guiding the sheet 4 conveyed by the intermediate drum 3b. With such a configuration, as shown in FIG. 8, the sheet 4 conveyed by the intermediate drum 3b is conveyed.
The paper edge of the sheet is extended along the peripheral surface of the intermediate body 3b (this is called the sheet extending effect) (in FIG. 8, for convenience, there is a gap between the sheet 4 and the intermediate body 3b). Exist). As a result, it is possible to prevent the sheet 4 from being attracted to the intermediate body 3 in a bent state, and to prevent the sheet 4 from being damaged due to the bending coming into contact with the drying device 17. .

Further, since the sheet 4 is surely brought into close contact with the intermediate body 3b by receiving the air jetted from the air shower 50, the sheet 4 can be stably adsorbed by the intermediate body 3b. There is. Here, it is preferable that the air shower 50 injects air into the predetermined region R of FIG. 8 with respect to the peripheral surface of the intermediate body in order to make the above effects remarkable. The region R is downward at an angle from the sheet receiving portion of the intermediate cylinder 3b (where the intermediate cylinders 3a and 3b are close to each other and the intermediate cylinder 3b receives the sheet 4 from the intermediate cylinder 3a) A about the rotation axis C0 of the intermediate cylinder 3b. It is an area within 45 degrees to the side.

Now, the image sensor (imaging means) 60
Is provided for the intermediate body 3b.
The printing surface of the sheet 4 that is sucked by b (the side opposite to the suction surface) is imaged. The image pickup information of the image sensor 60 is output to an analysis device (not shown), and the back side print quality of the sheet 4 can be analyzed and detected. Alternatively, the image pickup information may be output to a display device (not shown), and the operator may monitor the back surface print quality on the display device.

Since the sheet-fed printing press according to the third embodiment of the present invention is configured as described above, the suction of the sheet 4 by the intermediate cylinder 3b can be made stable, and the advantages of the above-described embodiment. Can be obtained more effectively. Further, since the back surface can be imaged in a stable state where the sheet 4 is attracted to the intermediate body 3b, there is also an advantage that the back surface printing quality of the sheet 4 can be accurately detected based on this imaging.

In the above embodiment, the air shower 50 is not provided, that is, the intermediate cylinder 3 having the suction mechanism.
Of course, a configuration in which only the image sensor 60 is added to b is also possible. In addition, in the above embodiment, with respect to the intermediate body 3b,
Although the air shower 50 and the image sensor 60 are provided,
The air shower 50 and the image sensor 60 may be provided for the intermediate body 3d.

(D) Others The present invention is not limited to the above-described embodiment, but various modifications can be made without departing from the scope of the present invention. For example, the above description has been made for the intermediate cylinder in front and back printing, but the present invention is not limited to this, and the drying effect of the drying device 17 can be achieved by preventing the sheet 4 from fluttering around the intermediate cylinder. As long as it conforms to the gist of the invention of the present application that it does not function sufficiently, and that problems such as poor drying such as uneven drying occur, and stains and scratches occur on the printed surface, including single-sided printing. It can be applied in any case.

In each of the above embodiments, the back surface printing device 1 and the front surface printing device 2 are arranged in this order from the upstream side in the running direction of the sheet 4, but the order is reversed and the front surface printing device 2 and the back surface You may arrange in order of the printing apparatus 1 from the upstream side of the traveling direction of the sheet 4. Further, in the above-described embodiment, four intermediate cylinders are arranged between the back surface printing apparatus 1 and the front surface printing apparatus 2, but the number of intermediate cylinders between the printing apparatuses 1 and 2 is the upper printing apparatus and the latter printing apparatus. The number of sheets on which the sheet 4 is wound on the impression cylinder as the outer peripheral surface, that is, the printing surface is different from that of the printing apparatus of FIG.

[0042]

As described in detail above, according to the intermediate cylinder for a sheet-fed printing press and the sheet-fed printing press of the present invention, the intermediate cylinder can suck the sheet on its peripheral surface and suppress the fluttering of the sheet. Therefore, when the intermediate cylinder is arranged so as to face the drying device, the drying effect of the drying device can be sufficiently functioned, and defective drying such as drying unevenness can be suppressed, and the sheet and the drying device It is possible to prevent contact and prevent stains or scratches on the printed surface.

Further, a switching means for selectively switching the connection between the suction box and the suction force applying means is provided, and the suction force to the plurality of suction boxes installed at mutually different rotational positions is provided by using this switching means. Can be switched. Therefore, the operation of adjusting the suction position of the sheet on the intermediate cylinder in accordance with the sheet size so as to stably suck the paper tail can be easily performed by operating the switching means.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a sheet-fed double-sided printing machine according to a first embodiment of the present invention.

FIG. 2 is a transverse cross-sectional view (cross-sectional view taken along the line XX in FIG. 3) of the intermediate body, which schematically represents the first embodiment of the present invention.

FIG. 3 is an axial cross-sectional view of the intermediate barrel, which schematically represents the first embodiment of the present invention.

FIG. 4 is a diagram showing an example of the arrangement of suction holes of the intermediate barrel shown in FIGS. 2 and 3 (a view taken in the direction of the arrow Y in FIG. 2).

FIG. 5 is a diagram showing a second embodiment of the invention of the present application, and schematically shows a state in which the intermediate drum section according to the invention of the present application is installed in a sheet-fed printing press.

FIG. 6 schematically illustrates a sheet-fed printing press according to a third embodiment of the present invention, and is a schematic cross-sectional view from a side view thereof.

FIG. 7 is a model perspective view of a sheet-fed printing press according to a third embodiment of the present invention, and is a schematic perspective view showing an intermediate cylinder and air ejecting means of the same.

FIG. 8 is a model side view of an air shower for a sheet-fed printing press according to a third embodiment of the present invention, and is a schematic side view for explaining the action and a preferable range of an air jet direction. is there.

FIG. 9 is an explanatory diagram showing a schematic configuration of a conventional sheet-fed double-sided printing machine.

FIG. 10 is an explanatory diagram of a problem that occurs in the intermediate body portion of the conventional sheet-fed double-sided printing machine.

FIG. 11 is an explanatory diagram of a printing device unit.

[Explanation of symbols]

1 Back side printing device 2 Surface printing device 3 (3a, 3b, 3c, 3d) Intermediate cylinder for sheet-fed printing press 4 seats 5 (5a, 5b) impression cylinder 6 (6a, 6b) connecting pipe 7 Switching valve (switching means) 7a, 7b opening 8 control valves 9 Inhalation tube 10 Suction machine (suction force applying means) 11 cells 12 inner cylinder 13 suction shaft 14 rotation axis 15 (15a, 15b) Suction box 16 Air suction hole 17 dryer 18 ink 19 sheet feeding device 20 Feeder board section 21 Paper ejection device 22 sheet conveying device 23 sheet stacking device 24 First Intermediate Body 25 Second intermediate body 26 Claw device 27 Paper output shaft 28 Endless Chain 29 Paper ejection table 30 paper feed table 31 ink reservoir 32 ink roller group 33 printing plates 34 plate cylinder 35 blanket body 36 Fountain solution 37 Air cylinder (actuator) 38 (38a, 38b) Suction port 50 air shower (air injection means) 50a Air injection port 51 Air piping 52 Pressure control valve 53 Air blower 60 image sensor (imaging means) 70 sheet guide

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinya Kobayashi             Hiroshima Prefecture Mihara City Itozakicho 5007 Mitsubishi Heavy Industries             Paper and printing machinery division F-term (reference) 2C020 AA04 AA05                 3F101 BA08 BB03 CE21 LA06 LB03

Claims (13)

[Claims] 1. An intermediate cylinder for conveying a sheet in a sheet-fed printing press, comprising a plurality of suction boxes formed at different rotational positions inside the cylinder main body, and each of the suction boxes described above. A plurality of suction holes formed so as to open on the outer surface of the body, a suction force applying means for applying a suction force to the suction box, and a connection between the suction boxes and the suction force applying means. An intermediate cylinder for a sheet-fed printing press, characterized in that it is provided with a switching means for switching to. 2. An intermediate cylinder for a sheet-fed printing press according to claim 1, wherein an actuator for operating the switching means is connected to the switching means. 3. The intermediate cylinder for a sheet-fed printing press according to claim 2, wherein the actuator comprises a fluid pressure cylinder. 4. The intermediate cylinder for a sheet-fed printing press according to claim 2, wherein the actuator comprises an electric motor. 5. The intermediate cylinder for a sheet-fed printing press according to any one of claims 1 to 4, wherein the intermediate cylinder is installed so as to face a drying device for drying the sheet. 6. A sheet-fed printing press, comprising the intermediate cylinder according to any one of claims 1 to 5. 7. An air injection unit for injecting air toward the peripheral surface of the body is provided so that the sheet transferred to the intermediate cylinder extends along the peripheral surface of the body.
The sheet-fed printing press according to claim 6. 8. The air injecting means of the air injecting means is performed within a range of 45 degrees downwardly from the sheet receiving position with respect to the peripheral surface of the intermediate cylinder at an angle about the rotation axis of the intermediate cylinder. The sheet-fed printing press according to claim 7, characterized in that. 9. A back surface printing device for printing on a lower surface of a running sheet and a front surface printing device for printing on an upper surface of the running sheet are arranged along a running path of the sheet, and the back surface printing device is provided. 9. The sheet-fed printing press according to claim 6, wherein the intermediate cylinder is used between the front surface printing apparatus and the front surface printing apparatus. 10. The sheet-fed printing press according to claim 9, wherein the back side printing device and the front side printing device are arranged in this order from the upstream side in the sheet traveling direction. 11. The sheet-fed printing press according to claim 10, further comprising image pickup means provided below the intermediate cylinder for picking up an image of the back surface of the sheet for inspecting the quality of the back surface printing. 12. A back surface printing device for printing on the lower surface of the running sheet and a front surface printing device for printing on the upper surface of the running sheet are arranged in this order along the running path of the sheet, and In a sheet-fed printing machine in which an intermediate cylinder is arranged between a back surface printing device and the front surface printing device, the delivered sheet is extended along the cylinder peripheral surface to at least one of the intermediate cylinders. Thus, the sheet-fed printing press is provided with an air ejecting means for ejecting air toward the peripheral surface of the body. 13. An air jet of the air jetting means is performed within a range of 45 degrees downward from the sheet receiving position with respect to the peripheral surface of the intermediate drum at an angle about the rotation axis of the intermediate drum. 13. The sheet-fed printing press according to claim 12, wherein: