JP4128688B2 - Sheet-fed rotary printing press - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet-fed rotary printing press capable of switching between single-sided printing and double-sided printing, and more particularly to a sheet-fed rotary printing press provided with a curl correcting means for correcting curl generated in a sheet-like material.
[0002]
[Prior art]
Generally, in this type of sheet-fed rotary printing press, ink or dampening water is supplied to the paper while being wound around a plurality of cylinders, so that the paper conveyed in the paper discharge device is curved after printing, so-called curling Therefore, a curl correcting means for correcting the curl is provided. The curl correcting means is provided with suction means for sucking air, and the curling is corrected by sucking in the direction opposite to the direction in which the paper is curled by the suction means.
[0003]
When this curl correcting means is applied to a sheet-fed rotary printing press capable of switching between single-sided printing and double-sided printing, the printing surface on the back side is in sliding contact with the curl correcting means during double-sided printing, There is a risk of rubbing traces. Therefore, in a sheet-fed rotary printing machine capable of switching between single-sided printing and double-sided printing, it is conceivable that the curl correcting means can be moved between a curl correcting position and a retracted position retracted from this position.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional sheet-fed rotary printing press, the operator performs a button operation to move the curl correction means between the curl correction position and the retracted position. For this reason, not only is the operation burden imposed on the operator, but if the button operation is forgotten, the curl is not corrected during single-sided printing, and the print quality is degraded. There was a problem that a trace of rubbing and a waste paper was generated.
[0005]
The present invention has been made in view of the above-described conventional problems, and a first object is to reduce an operation burden on an operator. The second purpose is to improve the printing quality and prevent the generation of waste paper.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is a sheet-fed rotary printing press capable of switching between single-sided printing and double-sided printing, and advances into the sheet-like material conveyance path to correct sheet-like material curl. A curl correcting means having a suction means for sucking the sheet-like material so as to be movable between the curl correcting position and the retreat position retracted from the curl correcting position and retracted from the sheet-conveying path ; A driving means for moving between the curl correction position and the retreat position; and when switching from double-sided printing to single-sided printing, the driving device is driven to move the curl correcting means to the curl correction position; identification and control means for controlling so as to the driving device is driven when it is switched on both sides printing moving said curl correcting means to the retracted position, the state of the single-sided printing and two-sided printing from And means for, in which said control means based on the identifying means controls the driving device.
Therefore, when the operator selects single-sided printing or double-sided printing, the curl correction means is automatically positioned at the curl correction position or the retracted position.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention, the curl correction means is provided with a suction means for sucking a sheet-like material, and the curl correction means is positioned at a retracted position by the control means. Sometimes the suction means is controlled to stop.
Accordingly, the suction means automatically stops when the curl correction means is positioned at the retracted position.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a sheet-fed rotary printing press according to the present invention, FIG. 2 is a cylinder arrangement diagram for explaining single-sided printing and double-sided printing, and FIG. 3 is a side view of a paper conveying device in the paper discharge device. FIG. 4 is an enlarged view of a portion IV in FIG. 5 is a view taken along the arrow V in FIG. 4, FIG. 6 is a view taken along the arrow IV in FIG. 5, FIG. 7 is a view taken along the arrow VII in FIG. It is a figure explaining the correction | amendment operation | movement of curl similarly by the curl correction means.
[0009]
In FIG. 1, 1 is a single-sided print button for starting single-sided printing, 2 is a double-sided printing button for starting double-sided printing, 3 is a paper size input button for inputting the paper size when switching to double-sided printing, and 4 is a curl to be described later An air cylinder 5 serving as a drive source for moving the correction means is an electromagnetic valve for connecting and disconnecting the suction air of the curl correction means. Reference numeral 6 denotes a control device that controls ON / OFF of the air cylinder 4 and the electromagnetic valve 5 in conjunction with the operation of the single-sided printing button 1 or the double-sided printing button 2.
[0010]
In FIG. 2, a second printing unit 10 and a third printing unit 11 that are adjacent to each other are provided downstream of the first printing unit (not shown) in the paper conveyance direction. In these printing units 10, 11, plate cylinders 10a, 11a on which printing plates are mounted and rubber cylinders 10b, 11b wound with blankets are in contact with each other. The second pressure drum 10c having a double diameter is in contact with the second pressure drum 10c.
[0011]
Further, the rubber cylinder 11b of the printing unit 11 is in contact with the third pressure cylinder 11c having a double diameter located on the downstream side of the second impression cylinder 10c, and the second impression cylinder 10c, the third impression cylinder 11c, and the like. In between, a double-diameter reversing cylinder 12 is provided such that its circumferential surface is in contact with both pressure cylinders 10c and 11c. A plurality of sets of gripper devices (hereinafter simply referred to as grippers) 13 including a claw and a claw base and opened and closed by a cam mechanism are provided at a position where the outer periphery of the second impression cylinder 10c is equally divided into two in the circumferential direction. The second impression cylinder 10c is juxtaposed in the axial direction. In addition, a plurality of sets of holding claws 14 that are opened and closed by a cam mechanism are juxtaposed in the axial direction of the third impression cylinder 11c at a location where the outer peripheral portion of the third impression cylinder 11c is equally divided in the circumferential direction. Yes. In addition, at a place where the outer peripheral portion of the reversing cylinder 12 is equally divided into two in the circumferential direction, a reversing claw 15 that is opened and closed by a cam mechanism, and a plurality of suction ports 16 connected to a suction air source such as a pump (not shown). These are adjacent to each other and are arranged in parallel in the axial direction of the reversing cylinder 12.
[0012]
In the case of switching from the double-sided printing shown in FIG. 2 to the single-sided printing, when the single-sided printing button 1 is turned on, the second impression cylinder so that the holding claw 13 of the second impression cylinder 10 c corresponds to the inversion claw 15 of the inversion cylinder 12. The phase of the cylinder group located upstream with respect to the paper conveyance direction including 10c is adjusted. When the second impression cylinder 10c, the reversing cylinder 12 and the third impression cylinder 11c rotate in this state, the rubber cylinder 10b and the second impression cylinder 10c of the printing unit 10 are transferred to the paper 8 which is carried by the gripping claws 13. The second color printing is performed when the paper 8 passes between the two, and the gripping end of the paper 8 is transferred from the gripping claw 13 to the reversing claw 15 and conveyed while being wound around the lower peripheral surface of the reversing cylinder 12. The The wound paper 8 is transferred from the reversing claw 15 to the holding claw 14 and conveyed, and when passing between the rubber cylinder 11b and the third impression cylinder 11c of the printing unit 11, it is placed on the same surface as before. The third color is printed.
[0013]
In order to switch from single-sided printing to double-sided printing, when the size of the paper 8 is input to the paper size input unit 3 and the duplex printing button 2 is turned on, first, the second impression cylinder 10c, the reverse cylinder 4 and the downstream side of the reverse cylinder 4 Rotation transmission to the cylinder group is cut off, only the second impression cylinder 10c is rotated, and the second impression cylinder 10c is rotated by the adjustment amount of the cylinder phase for double-sided printing by the control device 6. That is, the cylinder phase of the second impression cylinder 10 c is positioned with respect to the inversion cylinder 12 so that the gripping claw 13 of the second impression cylinder 10 c corresponds to the suction port 16 of the inversion cylinder 12. Next, in the control device 6, based on the paper size data input to the paper size input unit 3, the second impression cylinder 10c is rotated counterclockwise in the figure, and the gripper claw 14 is moved from the suction port 16 by a predetermined amount. That is, it is moved by the size of the paper.
[0014]
By adjusting the phase between the cylinders in this way, when the second impression cylinder 10c, the reversing cylinder 12 and the third impression cylinder 11c are rotated, the paper 8 which is carried by the gripping claws 13 is conveyed with rubber. The surface is printed when passing between the cylinder 10b and the second impression cylinder 10c. The paper 8 passes through the contact point between the second impression cylinder 10c and the inversion cylinder 12 without being replaced by the reversing claw 15, and is wound around the lower peripheral surface of the second impression cylinder 10c.
[0015]
When the paper bottom of the wound paper 8 reaches the contact point between the second impression cylinder 10c and the reversing cylinder 12, the paper bottom is sucked and conveyed by the suction port 16, and the gripping end is held by the gripping nail 13 during the conveyance. Released from. The paper bottom of the paper 8 sucked into the suction port 16 is reversed and turned upside down by being transferred to the reversing claw 15 and transferred from the reversing claw 15 to the holding claw 14 of the second impression cylinder 11c. And conveyed by the third impression cylinder 11c. The transported paper 8 is printed on the back surface when passing between the rubber cylinder 11b and the third impression cylinder 11c.
[0016]
In FIG. 3, what is generally indicated by a reference numeral 20 is a paper discharge device of a sheet-fed rotary printing machine, and this paper discharge device 20 has a pair of left and right paper discharge frames 21 and 21 (one paper discharge). The frame 21 is configured to support the whole by a not-shown). Reference numeral 22 denotes a pair of left and right sprockets (one of the sprockets 22 is not shown), which is coaxial with the discharge cylinder that contacts the impression cylinder of a fourth printing unit (not shown), and the left and right discharge frames 21 and 21. It is attached so that it may be close to.
[0017]
Between the pair of left and right sprockets 22 and 22 and the pair of left and right sprockets (not shown) rotatably supported at the front ends of the paper discharge frames 21 and 21, a pair of left and right paper discharge chains 23 and 23 ( One discharge chain 23 is stretched (not shown). By the rotation of these sprockets, the paper discharge chain 23 travels in the direction of arrow A in the figure, and a plurality of sets of claw rods composed of a claw shaft 24 and a claw base shaft 25 are provided between the left and right paper discharge chains 23, 23. The paper discharge chain 23 is supported at regular intervals in the running direction.
[0018]
On the claw shaft 24 and the claw base shaft 25, a plurality of claw and claw bases (not shown) are arranged in the axial direction so as to face each other, and a plurality of holding claw devices (hereinafter simply referred to as a claw claw). ) 26 is formed. The claw of the gripping claw 26 is configured to be opened and closed by a cam mechanism (not shown) so as to transport the paper 8 with the claw base, and is released from the gripper below the transport end portion. A paper stacking table (not shown) on which the falling paper 8 is stacked is provided.
[0019]
Reference numerals 28 and 29 denote upper and lower chain guides, which are vertically opposed to each other via a plurality of fixing brackets, and bolts 30 are attached to the left and right discharge frames 21 and 21 via a bracket 31 as shown in FIG. Is fixed. These upper and lower chain guides 28 and 29 are configured to guide the travel of the left and right paper discharge chains 23 and 23 in the direction of arrow A with the paper discharge chain 23 interposed therebetween. Reference numeral 32 denotes a guide plate formed of an iron plate, and is provided below the paper discharge chain 23 along the paper discharge chain 23.
[0020]
A guide bar 33 is provided between the paper discharge chain 23 and the guide plate 32, and is provided at a position corresponding to the non-image portion on the back surface of the double-side printed paper. It is supported so as to be movable in the width direction of the paper corresponding to the change in position. 34 is a suction device that has been widely known so far, and is for reducing the transport speed of the paper 8 that is released from the grip of 26 and falls on the paper stack.
[0021]
In the sheet discharge device of the sheet-fed rotary printing press configured as described above, a pair of gripping claws 26 comes into contact with a pressure drum of a fourth printing unit (not shown) as the sheet discharge chain 23 travels. The paper is replaced at a position facing the holding claw. The replaced paper 8 is conveyed obliquely upward by the traveling gripper 26 and guided while the back surface of the paper is in sliding contact with the guide bar 33. After that, when the paper is conveyed to above the paper stack, the claw of the gripping claw 26 is opened by a cam mechanism (not shown) and stacked on the paper stack.
[0022]
The above-described one-sided printing or two-sided printing cylinder phase adjusting device or paper discharge device is specially different from the one-sided, double-sided printing phase adjustment device and paper discharge device of the sheet-fed rotary press widely used conventionally. There is no. As shown in FIGS. 3 and 4, the feature of the present invention is that a curl correcting means 35 is provided on the paper transport path of the paper discharge device 20, and this curl correcting means 35 is provided by an air cylinder 4 as a driving means. The point is that it is movable between the curl correction position and the retracted position.
[0023]
In FIG. 5, reference numeral 37 denotes a support plate fixed so as to be suspended from the lower chain guide 29. A stopper 38 is fixed to the upper part, and a pair of guides is provided to the lower part so as to face the stopper 38. A bracket 39 is fixed. 4 and 5, the air cylinder 4 is fixed to the support plate 37 so as to be sandwiched between the guide brackets 39, and a slide bracket 41 is fixed to the upper end portion of the rod 4a. The slide bracket 41 is guided by a pair of guide rods 42 and 42 suspended between the guide bracket 39 and the stopper 38 so as to be movable up and down, and a bracket 43 having an inverted L-shaped cross section is fixed to a side surface. Yes.
[0024]
As shown in FIG. 8, the curl correcting means 35 is attached to a bottomed cylindrical air tube 45 and an outer peripheral portion of the air tube 45 so as to extend in the axial direction, and has a curved cross section. 46. A number of suction ports 47 are provided in a line in the axial direction at a position slightly above the position where the attachment plate 46 of the air tube 45 is attached. As shown in FIG. A suction air pipe 48 connected to a suction pump (not shown) is attached so as to communicate. The suction air pipe 48 is provided with the above-described electromagnetic valve 5, and is configured to switch between suction and release of air in the air pipe 45 by opening and closing the electromagnetic valve 5.
[0025]
As shown in FIG. 6, one end of a discharge air pipe 49 is connected to the open end of the air pipe 45, and a discharge pump (not shown) is connected to the other end of the discharge air pipe 49. Yes. As shown in FIG. 9, the attachment plate 46 is attached slightly below the central portion of the air tube 45, and the cross section is substantially V-shaped between the outer periphery of the air tube 45 and the attachment plate 46. The suction space 50 is formed. As shown in FIG. 8, a pair of attachment pieces 51, 51 having an L-shaped cross section project from both side ends of the attachment plate 46. By attaching these attachment pieces 51, 51 to the bracket 43 described above, the curl correcting means 35 is attached to the slide brackets 41, 41 so as to be spanned between the left and right discharge frames 21, 21.
[0026]
In such a configuration, as shown in FIG. 4, when the rod 4a of the air cylinder 4 moves forward, the attachment plate 46 of the curl correction means 35 advances into the paper conveyance path close to the gripping claw 26, that is, the curl correction position. To do. At this time, since the slide bracket 41 is in contact with the stopper 38, the curl correction position is always fixed. Further, when the rod 4 a of the air cylinder 4 is retracted, the contact plate 46 of the curl correcting means 35 is configured to retract to the retracted position retracted from the paper transport path separated from the gripper claw 26.
[0027]
Next, the curl correcting operation in the sheet-fed rotary printing press having such a configuration will be described.
First, when performing single-sided printing, when the single-sided printing button 1 is turned on in FIG. 1, the control device 6 controls the rod 4a of the air cylinder 4 to move forward and the solenoid valve 5 to open. With this control, the curl correction means 35 is positioned at the curl correction position as shown by a two-dot chain line in FIG. 4, and in FIG. 9, the air around the air tube 45 is sucked into the air tube 45 from the suction port 47. Is done.
[0028]
Accordingly, as shown in FIG. 9, when the paper 8 that has been fed through the gripping claw 26 and has been transported through the paper discharge device 20 passes through the curl correcting means 35, there is a gap between the suction port 47 and the paper 8. Negative pressure state. For this reason, the paper 8 curled so as to curve upward in the drawing is curved in the direction opposite to the curled state in the suction space 50 when passing through the curl correcting means 35, so that the curl is corrected.
[0029]
Next, when performing double-sided printing, when the double-sided printing button 2 is turned on after inputting the size of the paper 8 in the paper size input unit 3 in FIG. 1, the control device 6 moves the rod 4 a of the air cylinder 4. The electromagnetic valve 5 is controlled to be closed while being moved backward. By this control, as shown by a solid line in FIG. 4, the curl correction means 35 is positioned from the curl correction position to the retracted position, and the suction of air in the air pipe 45 is stopped. Therefore, the back side of the paper 8 conveyed through the paper discharge device 20 by the gripper claw 26 does not slide against the curl correcting means 35, and therefore, the printed surface on the back side is rubbed or scratched. The occurrence of waste paper can be prevented.
[0030]
In this way, by turning on the single-sided printing button 1 or the double-sided printing button 2, the control device 6 can automatically position the curl correction means 35 at the curl correction position and the retreat position. Therefore, there is no trace of scratches or scratches on the printing surface of double-sided printing due to forgetting to operate, and there is no need to forget to correct curl in single-sided printing, thus improving print quality and preventing the generation of damaged paper. In addition, the operation burden on the operator is reduced. Further, during double-sided printing, the suction of air in the air tube 45 is automatically stopped, so that the paper 8 is not accidentally sucked into the curled correction means 35 and the generation of damaged paper is prevented. Is done.
[0031]
Here, when paper dust stays in the air tube 45 or in the suction port 47 after the printing is finished, the air discharge pump (not shown) is operated to discharge the discharge air into the air tube 45 through the discharge air tube 49. By doing so, paper dust can be blown off from the suction port 47.
[0032]
FIG. 10 is a schematic configuration diagram showing a second embodiment of the curl correcting means of the present invention, where (a) shows a curl retracted position and (b) shows a curl correcting position.
The second embodiment is different from the first embodiment described above in that the support member 60 that moves the curl correcting means 35 is rotatably supported by the shaft 61. That is, as shown in FIG. 5A, during double-sided printing, the rod 4a of the air cylinder 4 advances, so that the support member 60 rotates about the shaft 61 in the clockwise direction in the figure. The curl correcting means 35 is positioned at the retracted position. On the other hand, at the time of single-sided printing, the rod 4a of the air cylinder 4 is retracted, whereby the support member 60 is rotated counterclockwise in the drawing with the shaft 61 as the rotation center, and the curl correction means 35 is moved to the curl correction position. Positioned on.
[0033]
In this embodiment, the present invention is applied to a sheet-fed rotary printing press equipped with a reversing mechanism 12 and equipped with a reversing cylinder 12. However, a front surface printing cylinder and a back surface printing cylinder are provided above and below a sheet-like material conveyance path. It is also applicable to a sheet-fed rotary printing press provided with Further, the control of the air cylinder 4 for driving the curl correcting means 35 is linked to the single-sided printing button 1 or the double-sided printing button 2, but the present invention is not limited to this, and by detecting the rotational position of the impression cylinder 11c. The state between single-sided printing and double-sided printing may be identified, and various design changes are possible. In addition, not only the paper 8 but also a sheet-like material that can be printed may be conveyed.
[0034]
【The invention's effect】
As described above, according to the first aspect of the present invention, the print quality is improved in single-sided printing, and the generation of damaged paper is prevented in double-sided printing. In addition, the operation burden on the operator is reduced.
[0035]
According to the second aspect of the present invention, the suction means automatically stops in the double-sided printing, so that it is possible to prevent the occurrence of damaged paper in the double-sided printing.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a sheet-fed rotary printing press according to the present invention.
FIG. 2 is an arrangement diagram of a cylinder for explaining single-sided printing and double-sided printing in a sheet-fed rotary printing press according to the present invention.
FIG. 3 is a side view of a paper transport device in a paper discharge device of a sheet-fed rotary printing press according to the present invention.
4 is an enlarged view of a portion IV in FIG. 3. FIG.
FIG. 5 is a view taken in the direction of arrow V in FIG.
6 is a view taken along arrow IV in FIG.
7 is a view taken along arrow VII in FIG.
FIG. 8 is a perspective view showing the appearance of curl correction means in the sheet-fed rotary printing press according to the present invention.
FIG. 9 is a diagram illustrating a curl correcting operation by a curl correcting unit in the sheet-fed rotary printing press according to the present invention.
FIGS. 10A and 10B are schematic configuration diagrams showing a second embodiment of the curl correcting means in the sheet-fed rotary printing press according to the present invention, wherein FIG. 10A shows a curl retracting position, and FIG. Indicates the position.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Single-sided printing button, 2 ... Double-sided printing button, 4 ... Air cylinder, 5 ... Solenoid valve, 6 ... Control apparatus, 12 ... Reverse cylinder, 26 ... Claw nail, 35 ... Curl correction means, 45 ... Air pipe, 46 ... Accessing plate, 47... Suction port, 48... Suction air tube, 50.

Claims (2)

In a sheet-fed rotary printing machine capable of switching between single-sided printing and double-sided printing,
The sheet-like object can be moved between a curl correction position that advances into the sheet-like material conveyance path and corrects the curl of the sheet-like material and a retreat position that retreats from the curl correction position and retreats from the sheet-like material conveyance path. Curl correction means having suction means for suction ;
Driving means for moving the curl correction means between the curl correction position and the retracted position;
When the double-sided printing is switched to the single-sided printing, the driving device is driven to move the curl correction means to the curl correction position, and when the single-sided printing is switched to the double-sided printing, the driving device is driven. Control means for controlling the curl correction means to move to the retracted position;
Means for identifying the status of single-sided printing and double-sided printing,
A sheet-fed rotary printing press characterized in that the control means controls the driving device based on the identification means. Te sheet-fed rotary printing press odor according to claim 1,
The previous SL control means, the sheet-fed rotary printing machine, characterized by controlling so as to stop the suction means when curl correcting section is positioned at the retracted position.

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