JP5156685B2 - Sheet-fed printing press reversing device and sheet-fed printing press - Google Patents

Description

  The present invention relates to a reversing device for a sheet-fed printing press capable of reversing the front and back of a sheet, and a sheet-fed printing press equipped with the reversing device.

  Conventionally, a transfer drum that conveys a sheet, an impression cylinder / storage drum provided downstream in the conveyance direction of the transfer drum, a reversing drum provided downstream in the conveyance direction of the impression cylinder / storage drum, and an impression cylinder / storage 2. Description of the Related Art A printing machine including a suction device provided below a drum is known (see, for example, Patent Document 1). In this printing machine, the sheet transferred from the transfer drum to the impression cylinder / storage drum flies between the impression cylinder / storage drum and the inversion drum when the sheet is reversed. At this time, the suction device helps the inverted sheet to quickly descend from the impression cylinder / storage drum.

JP 2004-189491 A

  At this time, according to the configuration of the conventional printing machine, if the sheet transferred from the impression cylinder / storage drum to the reversing drum is brought into contact with the suction device, the printed part printed on the sheet becomes dirty. With the sheet floating between the impression cylinder / storage drum and the reversing drum, the reversing drum is rotated and the sheet is wound around the reversing drum.

  However, if the sheet is lifted and the reversing drum is rotated in this state, the sheet is wound around the reversing drum in an unstable state (for example, deflection in the width direction). Wrinkles and paper breakage are likely to occur on the damaged sheet.

  Accordingly, the present invention provides a reversing device for a sheet-fed printing machine capable of suitably winding a sheet of paper that has been turned upside down from the transfer cylinder to the reversing cylinder, and a sheet-fed printing machine provided with the same. It is an issue to provide.

  The reversing device of the sheet-fed printing press according to the present invention is configured as a double cylinder, and is opposed to the transfer cylinder capable of transporting a sheet with the printed surface on which the pattern is printed facing the outer peripheral side, and the transfer cylinder And a reversing cylinder capable of transporting the sheet transferred from the transfer cylinder, and holding the rear end in the rotation direction of the sheet held on the outer periphery of the transfer cylinder by the reversing cylinder. Then, by rotating the reversing cylinder, the sheet is peeled from the transfer cylinder, and the peeled sheet is conveyed along the air conveyance path of the sheet formed between the transfer cylinder and the reversing cylinder. Thus, in the reversing device of the sheet-fed printing machine capable of reversing the front and back of the sheet, the printed sheet conveyed by the transfer cylinder has a blank portion extending in the sheet conveying direction. It is formed and arranged so as to be able to contact the margin of the sheet transported along the air transport path, and absorbs the sheet. Characterized by comprising a suction means possible.

  According to this configuration, the sheet can be conveyed along the air conveyance path by bringing the sheet into contact with the suction unit. As a result, the contact portion of the sheet with the suction means is adsorbed, and in this state, when the reversing cylinder holding the sheet is rotated, tension is applied to the sheet. That is, the sheet to which tension is applied can be in a stretched state without causing wrinkles or the like. For this reason, the reversing cylinder can wind up the stretched sheet, and the sheet can be suitably wound around the reversing cylinder. At this time, the adsorbing means does not contact the pattern portion of the sheet, but does contact the blank portion of the sheet, and therefore does not cause printing defects such as printing rubbing on the sheet.

  In this case, it is preferable that the suction means is disposed below the transfer cylinder and the reversing cylinder, and disposed below the common tangent line between the transfer cylinder and the reversing cylinder.

  According to this configuration, since the sheet moving along the aerial conveyance path and the suction unit can be preferably brought into contact with each other, the reversing cylinder can be suitably printed without causing wrinkles or the like on the sheet. Leaf paper can be wrapped around the circumference.

  In this case, it is preferable that the suction means is disposed on the lower side of the transfer cylinder so as to suck the paper bottom side of the sheet transported along the air transport path.

  According to this configuration, the sheet is conveyed along the aerial conveyance path with the rear end in the rotation direction as the paper head side, so that the sheet is transferred from the paper head side to the paper bottom side in the transfer cylinder. However, at this time, the paper bottom side of the sheet remains on the transfer cylinder, and thus easily interferes with the subsequent sheet. For this reason, by disposing the suction means on the lower side of the transfer cylinder, it is possible to positively peel off the paper bottom side of the sheet remaining on the transfer cylinder. Interference can be suppressed and the sheet can be transported suitably.

  In this case, it is preferable that at least one suction unit is disposed in the width direction of the sheet orthogonal to the transport direction.

  According to this configuration, a plurality of suction units can be suitably arranged according to the number of blank portions formed on the sheet.

  In this case, it is preferable to further include a suction moving means for moving the suction means in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction.

  According to this configuration, the placement position of the suction unit can be moved as appropriate, so that the suction unit and the sheet can be suitably brought into contact with each other.

  In this case, it is preferable that the suction moving means moves the suction means in advance to the arrangement position according to the type of the sheet to be used before printing the sheet.

  According to this configuration, the placement position of the suction unit can be moved in advance according to the type of the sheet to be used, so that the suction unit and the sheet can be suitably brought into contact with each other.

  In this case, it is preferable that the suction means has a suction belt having a plurality of suction holes on the surface.

  According to this configuration, the sheet moving along the aerial conveyance path and the suction belt can be brought into contact with each other. For this reason, since the sheet can be brought into surface contact with the suction belt, a tension can be suitably applied to the sheet.

  In this case, it is preferable that the suction belt is configured to be able to be rotated by a sheet conveyed while being in contact.

  According to this configuration, since the drive source for driving the suction belt can be eliminated, the configuration of the suction belt can be simplified.

  In this case, it is preferable that the suction belt operates so that the circulation speed is equal to or lower than the conveyance speed of the sheet conveyed while being in contact.

  According to this configuration, since the suction belt can positively apply tension to the sheet, it can suitably apply tension to the sheet wound around the reversing cylinder.

  In this case, it is preferable that the suction means has a suction roller having a plurality of suction holes on the peripheral surface.

  According to this configuration, the sheet moving along the aerial conveyance path and the suction roller can be brought into contact with each other. For this reason, the sheet can be in point contact with the suction roller.

  In this case, it is preferable that the suction means has a suction box having suction holes.

  According to this configuration, the sheet moving along the aerial conveyance path can be brought into contact with the suction box. For this reason, since the sheet can be brought into surface contact with the suction box, a tension can be suitably applied to the sheet.

  In this case, it is preferable that the transfer drum has a peeling unit that peels off the paper bottom side of the sheet to be transferred from the transfer drum to the reversal drum through the air conveyance path from the peripheral surface of the transfer drum. .

  According to this configuration, since the paper bottom side of the sheet remaining on the transfer drum can be positively peeled off by the peeling unit, it is possible to suppress interference with the subsequent sheet, which is preferable. It becomes possible to transport the sheet.

  In this case, the transfer drum has suction means for sucking air from the air holes formed in the peripheral surface of the transfer drum in order to adsorb the sheet to the peripheral surface, and the peeling means is removed from the air holes. It is preferable that it is an ejection means for ejecting air.

  According to this configuration, the suction unit and the ejection unit can also serve as the air holes formed in the peripheral surface of the transfer drum, so that the configuration can be simplified.

  In this case, it is preferable that the peeling means includes a peeling member that can protrude and retract from the peripheral surface of the transfer drum.

  According to this configuration, the sheet on the peripheral surface of the transfer drum can be peeled off by letting the peeling member appear and disappear.

  The sheet-fed printing machine of the present invention is capable of reversing the front and back of a sheet, a sheet feeding device capable of feeding sheets, a printing device that prints on sheets fed from the sheet feeding device, and The reversing device configured as described above, and a paper discharge device capable of discharging the printed sheet are provided.

  According to this configuration, it is possible to preferably reverse the sheet by the reversing device, and there is no occurrence of wrinkles or paper folding on the sheet, so that printing on the sheet is good. can do.

  According to the reversing device and the sheet printing machine of the sheet-fed printing machine of the present invention, since tension can be applied to the sheet conveyed along the air conveyance path, the sheet is given tension. The reversing cylinder can take up the sheet suitably.

FIG. 1 is a schematic diagram illustrating a sheet-fed printing press to which a reversing device according to the present embodiment is applied. FIG. 2 is an explanatory view showing the correspondence between the surface of the printed sheet and each vacuum wheel. FIG. 3 is a schematic diagram showing the operation of the reversing cylinder during duplex printing in the reversing device of the sheet-fed printing press of this embodiment. FIG. 4 is a schematic view showing an inversion double cylinder intermediate cylinder in the inversion device of the sheet-fed printing press of this embodiment. FIG. 5 is a schematic diagram showing the operation of the reversing cylinder during double-sided printing in the reversing device of the sheet-fed printing press of this embodiment. FIG. 6 is a schematic diagram illustrating the operation of the reversing cylinder during duplex printing when a peeling member is used in the reversing device of the sheet-fed printing press of this embodiment. FIG. 7 is an external perspective view of the suction roller. FIG. 8 is an external perspective view of the suction box.

  Hereinafter, a sheet-fed printing press reversing device and a sheet-fed printing press according to the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the following examples. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  A sheet-fed printing machine 1 according to the present embodiment is an offset sheet-fed printing machine capable of performing single-sided printing or double-sided printing on a sheet S. As shown in FIG. The apparatus 12 includes a printing apparatus 13, a reversing apparatus 14, and a paper discharge apparatus 15. The sheet S may be any printing sheet, and includes, for example, printing paper, a printing film, and the like.

  The paper feeding device 11 includes a paper feeding table 21 and a paper feeding mechanism (separator device) 22. The paper feed tray 21 stacks and places the sheets S, and the paper feed mechanism 22 puts a large number of sheets S stacked on the paper feed tray 21 one by one in order from the top. It is picked up and sent out. In this case, the paper feed tray 21 can be moved up and down in response to the supply of the sheet S so that the paper feed mechanism 22 can maintain a substantially constant height positional relationship with the sheet S. .

  The conveying device 12 conveys the sheet S sent out from the paper feeding device 11 and positions it at a predetermined position, and supplies it to the printing device 13. In this conveying device 12, a feed roller 23 and a gripping roller 24 are disposed in contact with each other adjacent to the paper feeding device 11, and a conveying belt 25 that is wound around a plurality of guide rollers is disposed. A front pad 26 is disposed adjacent to 13.

  The printing apparatus 13 includes four printing units 28, corresponding to four colors of black, black, magenta, and yellow so that two-color printing or color printing can be realized. 29, 30, and 31. Each printing unit 28, 29, 30, 31 has substantially the same configuration, and includes an inking device (not shown), a plate cylinder 32, a blanket cylinder 33, and an impression cylinder 34, and each printing unit 28, 29, 30, An intermediate cylinder 35 is provided between 31. The plate cylinder 32, the blanket cylinder 33, and the impression cylinder 34 are arranged so as to contact each other in this order from the upper side to the lower side in the vertical direction, and ink is supplied to the blanket cylinder 33 via the plate cylinder 32 by an inking device. Then, when the sheet S passes between the blanket cylinder 33 and the impression cylinder 34, the ink (picture) is transferred from the blanket cylinder 33 to the sheet S.

  The reversing device 14 is disposed between the printing units 29 and 30, and reverses the front and back of the sheet S and the conveying direction during printing when performing duplex printing. The reversing device 14 includes a reversing first intermediate cylinder 36, a reversing double cylinder intermediate cylinder (passing cylinder) 37, and a reversing cylinder 38. As will be described in detail later, a vacuum wheel 39 for adsorbing the sheet S is provided below the reversing double cylinder middle cylinder 37. Therefore, when performing single-sided printing, the sheet S passes from the printing unit 29 through the reverse first intermediate cylinder 36, the reverse double cylinder intermediate cylinder 37, and the reverse cylinder 38, and the front and back sides of the sheet S and the conveyance direction remain the same. In the state, it is sent to the printing unit 30. On the other hand, when performing double-sided printing, the sheet S is sent from the printing unit 29 to the reversing double cylinder intermediate cylinder 37 via the reversing first intermediate cylinder 36, and the reversing cylinder 38 detects the front and back of the sheet S. After the conveyance direction is reversed, the sheet is sent to the printing unit 30.

  The paper discharge device 15 conveys the sheets S printed by the printing device 13 and stacks them in an aligned state. The paper discharge device 15 includes a chain gripper mechanism 41 that conveys the sheet S, a paper discharge table 42 on which the printed sheets S are stacked, and the sheet S that is conveyed by the chain gripper mechanism 41. A sheet support unit 43 that appropriately supports and discharges the sheet S to the sheet discharge table 42 and a paper pad 44 that regulates the downstream side position of the sheet S in the traveling direction of the sheet discharge table 42 are provided. The chain gripper mechanism 41 receives the sheet S from the printing unit 31 disposed on the most downstream side with respect to the traveling direction of the sheet S and conveys the sheet S to a predetermined position above the sheet discharge table 42. The sheet discharge table 42 is continuous or stepwise so that the drop distance of the sheet S becomes substantially constant when the height of the top surface of the uppermost stage rises as the sheets S are stacked. Can be moved up and down.

  Therefore, in the above-described sheet-fed printing machine 1 of the present embodiment, when performing duplex printing, the sheet S stacked on the sheet feeding table 21 of the sheet feeding device 11 is fed from the top by the sheet feeding mechanism 22. The sheets are taken out one by one and sent to the conveying device 12, which positions the sheets S at predetermined positions and then sequentially supplies them to the printing device 13. In the printing apparatus 13, two-color printing is performed on the surface of the sheet S for each of the printing units 28 and 29. Then, as shown in FIG. 2, for example, two patterns E are printed on the surface of the sheet S in the width direction. At this time, since a blank portion H is formed around each pattern E, three blank portions H extending in the transport direction of the sheet S are formed on the sheet S.

  Thereafter, the reversing device 14 feeds the reversing first intermediate cylinder 36 to the reversing double cylinder intermediate cylinder 37, and the claw member of the reversing cylinder 38 holds the rear end of the sheet S to rotate the reversing cylinder 38. Along with this, the claw member is reversed while the sheet S is being conveyed, and the rear end portion of the sheet S picked up by the claw member is sent to the printing unit 30 as the paper head side. Then, after two-color printing is performed on the back surface of the sheet S for each of the printing units 30 and 31, the sheet S on which the printing has been performed is chained from the printing device 13 to the paper discharge device 15. The paper is conveyed while being gripped by the gripper mechanism 41, and stacked on the paper discharge tray 42.

  Here, with reference to FIG. 3 thru | or FIG. 5, the structure and operation | movement are demonstrated in detail about the inversion apparatus 14 in the sheet-fed printing press 1 of the present Example mentioned above.

  As shown in FIG. 3, in the reversing device 14 in the sheet-fed printing press 1 of the present embodiment, the reversing cylinder 38 is in contact with both between the reversing double cylinder intermediate cylinder 37 and the impression cylinder 34 of the printing unit 30. It is arranged to be able to rotate synchronously. The reversing body 38 is provided with a pair of claw devices 51 arranged at equal intervals in the circumferential direction on the outer periphery thereof, and each claw device 51 is driven by each claw driving device (not shown). Can do. Similarly, a pair of claw devices 37a and 34a arranged at equal intervals in the circumferential direction are also provided on the outer periphery of the inverted double cylinder middle cylinder 37 and the impression cylinder 34, and the claw devices 37a and 34a. Also, it can be driven by each claw driving device (not shown).

  Further, in the claw device 51 of the reversing drum 38, a pair of frames (operation side frame and driving side frame) (not shown) in the reversing drum 38 are provided with an outer claw shaft (front claw shaft) 54 and an inner claw shaft constituting the claw shaft. The shaft end portion of the (back claw shaft) 55 is rotatably supported. That is, the outer claw shaft 54 has a cylindrical shape, while the inner claw shaft 55 has a columnar shape. The inner claw shaft 55 is disposed inside the outer claw shaft 54 and is relatively rotatable. A front claw 58 is fixed to the outer claw shaft 54, and a back claw 60 is fixed to the inner claw shaft 55. As a result, the front and back claws 58 and the back claws 60 can be opened and closed as the claw shafts 54 and 55 are rotated, and the sheet S can be gripped or released.

  Therefore, by rotating the outer claw shaft 54, the front claw 58 can be operated to open and close the back claw 60, and by rotating the inner claw shaft 55, the back claw 60 can be operated. The front nail 58 can be opened and closed. Further, by rotating the outer claw shaft 54 and the inner claw shaft 55 in synchronization, the front claw 58 and the back claw 60 can be reversed while being closed or opened.

  Further, as shown in FIG. 3, in the reversing device 14 in the sheet-fed printing press 1 of the present embodiment, the reversing cylinder intermediate cylinder 37 has a pair of claw devices 37a arranged at equal intervals in the circumferential direction on the outer peripheral portion thereof. And a pair of air hole groups 66 in which a plurality of air holes 65 are arranged in the axial direction are provided at equal intervals in the circumferential direction. And each air hole group 66 is arrange | positioned so that it may be located in the rear-end part of the sheet S which the front-end part was held by each nail | claw apparatus 37a. At this time, the reversing double cylinder intermediate cylinder 37 is provided with a rotary valve 70 shown in FIG. 4, and suction and ejection of air from each air hole group 66 according to the rotation of the reverse double cylinder intermediate cylinder 37. Is configured to be executable at a predetermined timing.

  As shown in FIG. 4, as the predetermined timing, the suction end position T2 where the reversing cylinder intermediate cylinder 37 and the reversing cylinder 38 contact each other, and the suction end position T2 opposite to the center axis of the reversing cylinder intermediate cylinder 37 are sandwiched. There is a suction start position T1 located on the side. The rotary valve 70 is formed with a suction chamber 71 so that suction can be performed between the suction start position T1 and the suction end position T2, and a suction pump (suction means) 72 is connected to the suction chamber 71. The Further, as the predetermined timing, there is an ejection start position T3 that has moved a predetermined angle counterclockwise from the suction end position T2, and an ejection end position T4 that has moved a predetermined angle counterclockwise from the ejection start position T3. . The rotary valve 70 is formed with an ejection chamber 75 so that air can be ejected between the ejection start position T3 and the ejection end position T4, and a blower (ejection means) 76 is connected to the ejection chamber 75. Is done. At this time, the air ejection timing from the ejection start position T3 to the ejection end position T4 is a timing at which the paper bottom side of the sheet S to be peeled off from the reversing double cylinder intermediate cylinder 37 can be ejected. Note that, during the period from the suction end position T2 to the ejection start position T3 and from the ejection end position T4 to the suction start position T1, the air suction and ejection are in the off state.

  Accordingly, when the reversing double cylinder intermediate cylinder 37 rotates by holding the front end of the sheet S that circulates around the reversing first intermediate cylinder 36 by the claw device 37 a, the sheet S is pulled from the reversing first intermediate cylinder 36. While being peeled off, it is wound around the reverse double cylinder middle cylinder 37. Thereafter, the reverse double cylinder middle cylinder 37 sucks the rear end portion of the sheet S around the reverse first intermediate cylinder 36 by suction from the air hole group 66. Thereby, the reversing double cylinder intermediate cylinder 37 can take up the sheet S delivered from the reversing first intermediate cylinder 36.

  Next, the vacuum wheel 39 will be described with reference to FIGS. The vacuum wheel 39 adsorbs the surface (printing surface) of the sheet S transferred from the reversing cylinder middle cylinder 37 to the reversing cylinder 38 when the sheet S is reversed. A plurality (for example, three in this embodiment: see FIG. 2) are provided according to the number of blank portions H formed in the transport direction. The three vacuum wheels 39 are provided below a common tangent L between the reversing cylinder intermediate cylinder 37 and the reversing cylinder 38, and below the reversing cylinder intermediate cylinder 37. Each vacuum wheel 39 is composed of a plurality of pulleys 80 (three in this embodiment, for example) and suction belts 81 stretched over the plurality of pulleys 80, and the three vacuum wheels 39 are vacuum wheels. A moving device (suction moving means) 85 is configured to be movable in three dimensions.

  The three pulleys 80 in each vacuum wheel 39 are arranged in a triangle, with the two pulleys 80 being arranged in the horizontal direction and the one pulley 80 being arranged below the two horizontal pulleys 80. . The three pulleys 80 are configured to be freely rotatable, and the lower pulleys are configured to be vertically movable so as to adjust the tension of the suction belt 81. In this embodiment, the number of pulleys 80 is three. However, the number of pulleys 80 is not limited to this, and two pulleys 80 are arranged in the horizontal direction, and either one of the pulleys 80 is adjusted in the conveying direction in order to adjust the tension of the suction belt 81. It may be configured to be movable back and forth.

  Although not shown, the suction belt 81 has a plurality of suction holes formed on the surface thereof, and an suction chamber is formed inside the suction belt. The suction belt 81 can suck air from the surface by connecting a suction pump to the suction chamber.

  The vacuum wheel moving device 85 is configured to be able to move the three vacuum wheels 39 individually and as a whole. Specifically, the vacuum wheel 39 is moved in the width direction of the sheet S and in the transport direction of the sheet S. And it is configured to be movable in the vertical direction. Although not shown, the vacuum wheel moving device 85 includes, for example, a chain and a sprocket that meshes with the chain. Each vacuum wheel 39 is fixed to the chain, and the sprocket is rotated to rotate each vacuum wheel 39. Is moving. The vacuum wheel moving device 85 may have any configuration as long as each vacuum wheel 39 can be moved. Then, the vacuum wheel moving device 85 moves each vacuum wheel 39 to a predetermined position (preset position) in advance according to the type of the sheet S to be used before printing the sheet S.

  Accordingly, when the sheet S is transported in a state where the sheet S is adsorbed to each vacuum wheel 39, each pulley 80 of each vacuum wheel 39 is freely rotated. The sucked suction belt 81 is rotated along with the conveyance of the sheet S. At this time, each vacuum wheel 39 adsorbs the printing surface of the sheet S, but is disposed corresponding to the three blank portions H, and therefore adsorbs the sheet S without staining the pattern E. can do.

  Here, the operation of the reversing device 14 of the present embodiment will be described with reference to FIGS. 3, 4 and 5. In this case, one claw device 34a, 37a, 51 and one air hole group 66 are omitted in FIG.

  When double-sided printing is performed by the sheet printing machine 1 of the present embodiment, in the reversing device 14, the reversing double cylinder intermediate cylinder 37 rotates counterclockwise, and the nail device 37 a holds the front end of the sheet S. On the other hand, the reversing drum 38 rotates in the clockwise direction, and the claw device 51 faces rearward in the moving direction with the front claw 58 and the back claw 60 left open. Then, the rear end portion of the sheet S conveyed by the reversing cylinder intermediate cylinder 37 approaches the contact position (T2) with the reversing cylinder 38, and the claw device 51 of the reversing cylinder 38 moves the reversing cylinder intermediate cylinder. When approaching the contact position (T2) with 37, the claw device 51 grips the rear end of the sheet S. In parallel with the operation of the claw device 51, the suction by the suction pump 72 is turned off by the rotary valve 70.

  Thereafter, when the reverse cylinder 38 rotates, the sheet S is peeled off from the reverse double cylinder intermediate cylinder 37 from the rear end portion to the front end portion. At this time, the sheet S is transported along an air transport path K formed between the reversing cylinder 38 and the reversing double cylinder intermediate cylinder 37. The rear end portion of the sheet S received by the nail device 51 becomes the paper head side and enters the aerial conveyance path K, while the front end portion of the sheet S becomes the paper bottom side. Remains in the inverted double cylinder middle cylinder 37. This is because the reversing cylinder intermediate cylinder 37 rotates at a high speed, so that a negative pressure is generated between the reversing cylinder intermediate cylinder 37 and the sheet S, and the sheet S is attracted to the reversing cylinder intermediate cylinder 37 side. Because. Therefore, air from the air hole group 66 is blown out from the air hole group 66 in order to peel off the paper bottom side of the sheet S remaining on the reverse double cylinder intermediate cylinder 37 from the reverse double cylinder intermediate cylinder 37.

  Then, the paper bottom side of the sheet S is blown off to each vacuum wheel 39 side and is attracted to each vacuum wheel 39. When the reversing cylinder 38 rotates in this state, the paper bottom side of the sheet S is adsorbed to each vacuum wheel 39, so that each vacuum wheel 39 is rotated on the sheet S. Resistance is applied, whereby tension is applied to the sheet S. In this state, the reversing drum 38 rotates, whereby the sheet S can be suitably wound. Since each vacuum wheel 39 operates in conjunction with each other, each vacuum wheel 39 performs an intermittent operation in accordance with the adsorption of the sheets S sequentially conveyed.

  According to the above configuration, when the sheet S is turned upside down during double-sided printing, the bottom of the sheet S conveyed along the aerial conveyance path K is attracted to each vacuum wheel 39. Thus, tension can be applied to the sheet S. For this reason, it is possible to give tension to the sheet S wound around the reversing cylinder 38, whereby the reversing cylinder 38 causes the sheet S to be given tension to be wrinkled or folded. It can wind up suitably.

  Further, since each vacuum wheel 39 is provided below the common tangent L of the reversing cylinder 38 and the reversing cylinder middle cylinder 37, the vacuum wheel 39 is not attracted to the vacuum wheel 39 while the sheet S is pushed up. In other words, if the sheet S is pushed up and sucked by each vacuum wheel 39, the sheet S between the three vacuum wheels 39 hangs down, and the sheet S viewed from the transport direction. Becomes W-shaped, and wrinkles are likely to occur. Therefore, by adsorbing the sheet S to each vacuum wheel 39 without pushing up the sheet S, the shape of the sheet S viewed from the conveyance direction can be made substantially flat, and the generation of wrinkles and the like can be suppressed. It becomes possible.

  Further, each vacuum wheel 39 is disposed below the reversing double cylinder intermediate cylinder 37 and air is ejected from each air hole group 66, so that the paper bottom of the sheet S remaining on the reversing double cylinder intermediate cylinder 37 is obtained. The side can be suitably peeled off from the inverted double cylinder middle cylinder 37. Thereby, it is possible to suppress interference between the paper bottom side of the sheet S remaining on the reversing double cylinder intermediate cylinder 37 and the leading end side of the subsequent sheet S, and wrinkles, paper breaks, and printing due to the interference can be suppressed. Printing defects such as threads can be reduced.

  Further, since the three vacuum wheels 39 can be moved three-dimensionally individually and entirely by the vacuum wheel moving device 85, the position of each vacuum wheel 39 can be set to a suitable position. Specifically, even if the position of the margin portion H formed on the printing surface of the sheet S is changed in the width direction, each vacuum wheel 39 is moved in the width direction of the sheet S in accordance with the margin portion H. By appropriately moving, each vacuum wheel 39 can be suitably adsorbed to the blank portion H of the sheet S. Further, since the height of each vacuum wheel 39 and the front-rear position in the transport direction can be appropriately changed according to the type of the sheet S used, each vacuum wheel 39 has various types of sheet S. Can be suitably adsorbed.

  Furthermore, since the sheet S and the suction belt 81 can be brought into surface contact with each other by using the vacuum wheel 39 having the suction belt 81, a tension can be suitably applied to the sheet S.

  In this embodiment, the three pulleys 80 are configured to be freely rotatable. However, at least one pulley 80 may be a driving pulley, and the suction belt 81 may be operated in the circumferential direction. At this time, it is preferable that the suction belt 81 operates so that the circulation speed is equal to or lower than the conveyance speed of the sheet S conveyed while being in contact. According to this configuration, the suction belt 81 can positively apply tension to the sheet S, and thus can suitably apply tension to the sheet S wound around the reversing drum 38.

  In this embodiment, the structure of the inversion double cylinder intermediate cylinder 37 is simplified by performing suction and ejection of air from the air hole group 66. However, the suction air hole group and the ejection An air hole group is separately formed on the outer peripheral portion of the inverted double cylinder middle cylinder 37, and air is sucked from the air hole group for suction at a predetermined timing, and air is ejected from the air hole group for ejection at a predetermined timing. May be performed. Further, as shown in FIG. 6, the peeling member 100 that peels off the paper bottom side of the sheet S remaining on the reversing double cylinder intermediate cylinder 37, and the peeling member 100 is caused to appear and disappear from the outer peripheral surface of the reverse double cylinder intermediate cylinder 37. An in / out movement mechanism 101 may be provided separately, and the exfoliation movement mechanism 101 may cause the peeling member 100 to invade and exit from the outer peripheral surface of the inverted double cylinder middle cylinder 37 at a predetermined timing. Also in this configuration, the paper bottom side of the sheet S remaining on the reversing double cylinder intermediate cylinder 37 can be suitably peeled off.

  Furthermore, in this embodiment, each vacuum wheel 39 is used to apply tension to the sheet S wound around the reversing drum 38. Instead, a suction roller 105 shown in FIG. Also good. The suction roller 105 has a plurality of suction holes 106 formed on the outer periphery thereof, and is disposed so that the blank portion H of the sheet S is sucked to the outer peripheral surface of the suction roller 105. Even in this configuration, since the tension can be applied to the sheet S by attracting the sheet S to the suction roller 105, the sheet S wound around the reversing drum 38 can be stretched. it can. As a result, the reversing drum 38 can suitably wind up the sheet S to which tension is applied without causing wrinkles or paper breakage. In this case, the suction roller 105 may be configured to be freely rotated, or may be rotated so as to be in the reverse direction with respect to the transport direction of the sheet S.

  Further, in this embodiment, each vacuum wheel 39 is used to apply tension to the sheet S wound around the reversing cylinder 38. Instead, a suction box 110 shown in FIG. 8 is provided. Also good. The suction box 110 has a plurality of suction holes 111 formed on the upper surface thereof, and is disposed on the upper surface of the suction box 110 so that the blank portion H of the sheet S is sucked. Even in this configuration, since the tension can be applied to the sheet S by adsorbing the sheet S to the adsorption box 110, the sheet S wound around the reversing drum 38 can be stretched. it can. As a result, the reversing drum 38 can suitably wind up the sheet S to which tension is applied without causing wrinkles or paper breakage.

  As described above, the reversing device and the sheet printing press of the sheet-fed printing press according to the present invention are useful for performing double-sided printing on a sheet, and in particular, printing such as wrinkles and paper breaks in the reversing device. Suitable for suppressing defects.

1 sheet-fed printing machine 11 paper feeding device 12 transport device 13 printing device 14 reversing device 15 paper discharge device 21 paper feed table 22 paper feed mechanism 23 feed roller 24 tail roller 25 transport belt 26 front contact 28, 29, 30, 31 Printing unit 32 Plate cylinder 33 Blanket cylinder 34 Impression cylinder 34a Impression cylinder claw device 35 Intermediate cylinder 36 Inverted first intermediate cylinder 37 Inverted double cylinder intermediate cylinder 37a Inverted cylinder intermediate cylinder nail device 38 Invert cylinder 39 Vacuum wheel 41 Chain gripper Mechanism 42 Discharge stand 43 Sheet support unit 44 Paper pad 51 Reverse claw device 54 Outer claw shaft (front claw shaft)
55 Inner nail axis (back nail axis)
58 Front Claw 60 Back Claw 65 Air Hole 66 Air Hole Group 70 Rotary Valve 71 Suction Chamber 72 Suction Pump 75 Blowout Chamber 76 Blower 80 Pulley 81 Adsorption Belt 85 Vacuum Wheel Movement Device 100 Peeling Member 101 Intrusion Movement Mechanism 105 Adsorption Roller 106 Suction Hole 110 Suction box 111 Suction hole S Sheet E E Pattern H Blank space K Air transport path L Common tangent T1 Suction start position T2 Suction end position T3 Ejection start position T4 Ejection end position

Claims (12)

A transfer cylinder configured to be doubled and capable of transporting a sheet of paper with a printed surface on which an image is printed facing outward, and disposed opposite to the transfer cylinder and receiving from the transfer cylinder A reversing cylinder capable of transporting the passed sheet, and holding the reversing cylinder by holding the rear end portion in the rotation direction of the sheet held on the outer periphery of the transfer cylinder by the reversing cylinder. By rotating the sheet, the sheet is peeled off from the transfer cylinder, and the peeled sheet is formed along the air conveyance path of the sheet formed between the transfer cylinder and the reversing cylinder. In the reversing device of the sheet-fed printing machine capable of reversing the front and back of the sheet by conveying,
The printed sheet conveyed by the transfer cylinder is formed with a blank portion extending in the conveyance direction of the sheet,
An adsorbing means disposed so as to be able to contact the blank portion of the sheet conveyed along the aerial conveyance path, and capable of adsorbing the sheet ;
The suction means has a suction belt having a plurality of suction holes on the surface,
The reversing device for a sheet-fed printing machine, wherein the suction belt is configured to be rotated by the sheet conveyed while being in contact. The reversing device for a sheet-fed printing press according to claim 1 , wherein the suction belt is operated so that a circulation speed thereof is equal to or lower than a conveyance speed of the sheet conveyed while being in contact.   A transfer cylinder configured to be doubled and capable of transporting a sheet of paper with a printed surface on which an image is printed facing outward, and disposed opposite to the transfer cylinder and receiving from the transfer cylinder A reversing cylinder capable of transporting the passed sheet, and holding the reversing cylinder by holding the rear end portion in the rotation direction of the sheet held on the outer periphery of the transfer cylinder by the reversing cylinder. By rotating the sheet, the sheet is peeled off from the transfer cylinder, and the peeled sheet is formed along the air conveyance path of the sheet formed between the transfer cylinder and the reversing cylinder. In the reversing device of the sheet-fed printing machine capable of reversing the front and back of the sheet by conveying,
  The printed sheet conveyed by the transfer cylinder is formed with a blank portion extending in the conveyance direction of the sheet,
  An adsorbing means disposed so as to be able to contact the blank portion of the sheet conveyed along the aerial conveyance path, and capable of adsorbing the sheet;
  The suction means has a suction roller having a plurality of suction holes on the peripheral surface,
  The reversing device of a sheet-fed printing machine, wherein the suction roller is configured to be freely rotatable. 2. The suction means is disposed below the transfer cylinder and the reversing cylinder, and is disposed below a common tangent line between the transfer cylinder and the reversing cylinder. 4. A reversing device for a sheet-fed printing machine according to any one of items 1 to 3 . 2. The suction unit is disposed on a lower side of the transfer cylinder so as to be able to suck a paper bottom side of the sheet transported along the aerial transport path. 5. A reversing device for a sheet-fed printing press according to any one of items 1 to 4 . The suction means, a sheet-fed printing press of the reversing device according to any one of claims 1, characterized in that it is provided one or more in the width direction of the sheet perpendicular to the conveying direction 5 . It said suction means, at least the X-axis direction, according to any one of claims 1 to, further comprising a suction means for moving in either direction of the Y-axis and Z-axis directions 6 Inversion device for sheet-fed printing press. 8. The sheet according to claim 7 , wherein the suction moving unit moves the suction unit to an arrangement position according to a type of the sheet to be used before printing the sheet. Inversion device for leaf printing machine. The transfer cylinder has a peeling means for peeling the paper bottom side of the sheet to be transferred from the transfer cylinder through the aerial conveyance path to the reversal cylinder from the peripheral surface of the transfer cylinder. The reversing device for a sheet-fed printing press according to any one of claims 1 to 8 . The transfer drum has suction means for sucking air from air holes formed in the peripheral surface of the transfer drum in order to adsorb the sheet to the peripheral surface;
The reversing device for a sheet-fed printing press according to claim 9 , wherein the peeling unit is a jetting unit that jets air from the air hole. The reversing device for a sheet-fed printing press according to claim 9 , wherein the peeling means includes a peeling member that can protrude and retract from a peripheral surface of the transfer drum. A paper feeding device capable of feeding sheets,
A printing device for printing on a sheet fed from the paper feeding device;
The reversing device according to any one of claims 1 to 11 , wherein the reversing device is configured to be able to reverse the front and back of the sheet.
A sheet-fed printing machine comprising: a sheet discharge device capable of discharging the printed sheet after printing.

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