JPH0428762Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is a sheet-fed rotary printing press with a reversing mechanism that can perform double-sided printing with one machine. This invention relates to a paper tail suction device that is held in the mouth.

[Conventional technology]

With the diversification of printing, there are a variety of sheet-fed rotary presses with a reversing mechanism that can be used for normal single-sided printing and double-sided printing, which prints on the back by flipping the paper over after printing on the front side. Although these printing machines, which have been proposed and put into practical use, differ in the number and arrangement of cylinders and the structure of the reversing mechanism, the paper reversing operation is almost the same in all of them.

FIG. 12 is a cylinder arrangement diagram shown to explain the reversing operation of this type of printing press, and to explain this based on the figure, the first printing unit 1 and the second printing unit 2 of the printing press are is equipped with a plate cylinder 3 on which a printing plate is attached to the circumferential surface, and an inking device and a water supply device (not shown) that supply ink and water to the plate surface, and below each plate cylinder 3 is a plate with the same diameter. Blanket cylinders 4, onto which the image on the printing plate is transferred, are arranged with their circumferential surfaces facing each other. Further, below each blanket cylinder 4, an impression cylinder 5 and an impression cylinder 6 having twice the diameter thereof are arranged with their circumferential surfaces facing each blanket cylinder 4, and both impression cylinders 5, A reversing cylinder 7 having the same diameter as the reversing cylinder 6 is provided between the reversing cylinders 6 and 6 with their circumferential surfaces facing each other. Reference numeral 8 denotes a swing device that swings by a cam mechanism, and is equipped with a swing claw that opens and closes by the cam mechanism. The impression cylinder 5 is configured to be gripped by a gripping claw device 13 (hereinafter simply referred to as the claw 13) consisting of a claw 11 and a claw base 12. The pawls 13 are provided at locations that equally divide the outer peripheral portion of the impression cylinder 5 into two in the circumferential direction, and the other impression cylinders 6 are also provided with pawls 14 having the same configuration. The reversing cylinder 7 has a claw 1 due to the rotation of each cylinder.
A reversing claw 15 and a suction lever 16 as a paper tail suction device are arranged in close proximity to each other at two locations corresponding to 3.
The suction lever 16 is rotated, opened and closed, and the suction lever 16 is rotated. The figure shows the cylinder phase in the case of single-sided printing, and the paper 10 printed between the blanket cylinder 4 and the impression cylinder 5 is transferred from the claw 11 to the reversing claw 15 as in a general single-sided printing machine. is,
Furthermore, the reverse claw 15 is changed to the claw 14 and 2
Colorful printing is applied. In this case, suction lever 1
6 is not used.

In the case of double-sided printing, the circumferential phase of the upstream cylinder including the impression cylinder 5 and the downstream cylinder including the reversing cylinder 7 is shifted by the length of the paper 10, and the claw 13 is used to grip the cylinder in the circumferential direction. The end of the paper 10 that has been drawn is made to correspond to the reversing claw 15. In this state, when each cylinder is rotated in the direction of the arrow, the paper 10 held by the claw 13 rotates until the tail end of the paper 10 corresponds to the reversing claw 15, and at the same time the paper 10 is released from the grip of the claw 13 and the reverse claw 15 grips the tail of the paper, and each cylinder subsequently rotates in the direction of the arrow, so that the paper 10 with the tail of the paper in its grip is turned inside out and attached to the lower circumferential surface of the reversing cylinder 7. After this, as in the case of single-sided printing, printing is performed on the back side between the impression cylinder 6, which is gripped by the claw 14 and the blanket cylinder 4.

In such double-sided printing, the suction lever 16 is slightly ahead of the reversing claw 15 in the direction of rotation of the reversing cylinder 7, and rotates by suctioning the tail end of the paper to the leading suction surface using air from an air source. This serves to hold the tail of the paper in its mouth in the direction of the reversing claw 15.

[Problem that the invention attempts to solve]

However, in the conventional paper tail suction device, the suction head at the tip of the suction lever 16
When both cylinders 5 and 7 rotate in the direction of the arrow in the short time between suctioning the paper tail and holding it in the reversing claw 15, the suction lever 16 also rotates slightly, and during this time, the paper 10 has the paper tail. A force is applied in the direction of peeling off the suction surface. If even some of the suction holes on the suction surface open and suck outside air from between the paper and the paper without sucking the end of the paper,
In some cases, the tail of the paper that has been adsorbed is peeled off, resulting in so-called paper dropping, and a satisfactory paper delivery function cannot be expected.

[Means for solving problems]

In order to solve these problems, the present invention uses a suction plate made of a thin plate of elastic material with a large coefficient of friction and has a plurality of small holes on the suction surface of the suction head. I covered it and glued it on.

[Effect]

With this configuration, when the impression cylinder and the reversing cylinder rotate and the end of the paper held by the claw of the impression cylinder faces the reversing claw of the reversing cylinder and the suction lever, the reversing claw opens and the suction lever After the suction head suctions the paper tail with its suction surface, the suction lever rotates and the reverse claw grips the paper tail, but at this time, a suction plate made of an elastic material is placed between the paper tail and the suction surface. is present, so the paper tail is not peeled off from the suction surface.

〔Example〕

1 to 11 show an embodiment of the paper tail suction device according to the present invention, FIG. 1 is a side view thereof, and FIG.
The figure is an enlarged plan view of the suction head, and Figure 3 is the same as Figure 2.
AA sectional view, Fig. 4 is BB sectional view of Fig. 2, Fig. 5
The figure is a plan view before the suction plate is pasted, Figure 6 is a cross-sectional view of the reversing mechanism implementing the present invention, and Figure 7 is a cross-sectional view showing the end of the paper being sucked and held in the reversing claw. 8 to 11 are operation explanatory diagrams. An overview of the entire torso arrangement and reversal operation is provided in the 12th section.
Since the explanation has been made based on the figure, the explanation will be omitted, and the same figure will be used for further explanation when necessary. In the figure, the reversing cylinder 7 is pivoted on left and right frames and rotates in the direction shown by arrow C in the figure.
On the outer periphery, two sets of paper holding and reversing mechanisms are arranged at positions that bisect the circumferential direction. This 2
Since the sets have exactly the same configuration, only one of them will be explained. The inversion trunk 7 is formed into a lightweight skeleton shape with a shaft core, an outer peripheral part, and a plurality of arms connecting these parts, and disk-shaped pillows 20 are integrally provided at both ends of the inversion trunk 7. It is being A claw shaft 21 is supported on the left and right pillows 20 with its movement in the axial direction restricted, and the claw shafts 21 are supported at multiple locations in the center by claw bearings fixed to the bottom of the trunk circumferential notch 22. 23. What is designated as a whole by the reference numeral 24 is a plurality of sets of reversing claw devices arranged in parallel on a claw shaft 21 at different phases in the axial direction from the claws 13 and 14 on the impression cylinders 5 and 6. 25 and a reversing accessory 26, of which the reversing claw 25 is attached to a claw holder 29 which is fixed to the claw shaft 21 together with a spring receiver 27 with a bolt 28.
and a pawl 31 rotatably attached to the eccentric portion of the pawl holder 29 with a pivot 30, and the pawl 31 has an adjusting screw 32 whose stepped portion abuts the upper surface of the pawl holder 29. is screwed in. A toe spring 33 is interposed between the rear end of the pawl 31 and the pawl holder 29, which applies a rotational force to the pawl 31 in the counterclockwise direction in FIG. Further, the claw base accessory 26 includes a claw holder 34 formed in a boat shape that houses the reversing claw 25.
and a claw rest 36 attached to the tip with a bolt 35 facing the claw 31, and the other free end of this small claw rest 26 and the spring receiver 27 of the reversing claw 25 A pawl spring 37 is interposed between the pawls 31 and the pawl base 36, which springs them in the direction of closing them.
Furthermore, a stopper stand 39 extending over the entire length of the body is fixed to a notch 38 provided on the body circumference near the tip of the reversing claw device 24 with a bolt 40. bolt 35
A plurality of stoppers 41 that come into contact with each other to restrict the rotation of the reversing claw device 24 are screwed in with screws to prevent loosening.

A pinion (not shown) fixed to the shaft end of the claw shaft 21 meshes with a segment gear (not shown) fixed to the shaft end of the lever shaft 42 parallel to the pinion, and the segment gear rotates the reversing cylinder 7. At the same time, when the cam mechanism on the frame side is reciprocated by a predetermined angle in the forward and reverse directions, the pinion that meshes with the cam mechanism rotates, and the entire reversing pawl device 24 is moved to the position shown in FIG. 6 and the position shown in FIG. 7. It is configured to rotate back and forth between the two at predetermined timing. The stopper 43 screwed into the stopper base 39 is a stopper that restricts the rotation of the small claw base item 26 at the position shown in FIG. The opening and closing of the reversing claw 25 is performed by the reversing claw 25 passing through an opening/closing cam (not shown) provided on the frame side.

On the other hand, in the notch 22 of the reversing cylinder 7, a suction lever shaft 44 formed in the shape of a hollow tube is rotatably supported by the left and right pillows 20, and a plurality of central parts thereof are connected to the notch 22. It is pivotally supported by a bearing 45 within the notch 22. Reference numeral 46 denotes a plurality of suction levers that are arranged in parallel on the suction lever shaft 44 with a slight phase difference in the axial direction from each reversing claw device 24, and are formed in a dogleg shape when viewed from the side. The suction lever shaft 44 is fixed to the suction lever shaft 44 with bolts 47. A suction head 48 is fixed to one free end of the suction lever 46 with a bolt 49, and a suction port 50 made of silicone rubber and having a rectangular shape in plan view is attached to the suction head 48 by baking. It is fixed. The surface of the suction port 50 is formed in an inclined arc shape such that the leading side is higher than the trailing side with respect to the direction of rotation of the body, and a connecting groove 51 having a V-shaped cross section is connected to this surface. A pair of strip-shaped suction holes 52 are provided. On the other hand, a circular concave hole 54 is provided on the lower surface of the suction head 48, and the concave hole 54 communicates with the circular hole of the suction lever shaft 44 through an L-shaped air passage 53. The suction holes 52 are two air passages 55 and 56.
It is communicated with. Reference numeral 57 is a protrusion provided on the bottom surface of each suction hole 52. Reference numeral 58 is a suction plate made of a silicone rubber sheet approximately 0.5 mm thick, shown as an example of an elastic material with a large coefficient of friction, and formed in the same shape as the mouthpiece 50 and bonded to the surface of the mouthpiece 50 with adhesive. A plurality of small holes 59 corresponding to each suction hole 52 and a small hole 60 between them are bored, and this suction plate 58 is formed larger than the suction port 50 as shown in FIG. It was pasted and then cut.

The inner hole of the suction lever shaft 44 is connected to a vacuum pump or the like as an air source via a rotary valve (not shown), and as described above, the end of the paper held by the claw 11 of the impression cylinder 5 is The passage 53, the recessed hole 54, the air passages 55, 56, the suction hole 52; configured to be suctioned onto the surface of the suction plate 58 via the connecting groove 51 and the small holes 59, 60. Numeral 61 is a valve pin attached to the suction lever 46 so as to cross the air passage 53, and is softly braked by a synthetic resin bolt 62, so that the air passage 53 is opened and closed by rotating the valve pin 61. It is configured.

A suction lever shaft 4 to which a paper tail suction device 63 consisting of a suction lever 46 and the like configured as described above is fixed.
A pinion (not shown) is fixed to the shaft end of the lever shaft 44, and a segment gear (not shown) that meshes with the pinion is fixed to the shaft end of the lever shaft 64 parallel to the suction lever shaft 44. As the reversing cylinder 7 rotates, the segment gear reciprocates by a predetermined angle in the forward and reverse directions by the cam mechanism on the frame side, and by meshing with the pinion, the entire paper tail suction device 63 is moved to the position shown in FIG. It is configured to rotate back and forth between the positions shown in FIG. 7 at predetermined timing. Reference numeral 65 denotes a stopper provided at the other free end of the suction lever 46, which is formed by a bolt, a double nut 66, and a buffer spring 67. 66 and suction lever 4
6 is configured to restrict rotation. The suction lever 46 is formed into an L-shape in plan view so that only the stopper 64 is in phase with the reversing pawl 25 in the axial direction, and the other parts are out of phase with the reversing pawl 25 in the axial direction. .

The operation of the printing press configured as above will be explained. First, in the single-sided printing shown in FIG. 8, when printing is started with the paper tail suction device 63 inactive, the sheets of paper 10 fed one by one onto the differential plate 9 are
It is transferred to the claw 13 of the impression cylinder 5 via the switching device 8 and wound around the impression cylinder 5, and when it passes between the blanket cylinder 4 and the blanket cylinder 4, printing is applied to the surface on the blanket cylinder 4 side. Then, each cylinder further rotates and the claw 13 of the impression cylinder 5
When the reversing claw device 24 faces, the cam mechanism rotates the claw 3.
1 opens and closes, and at the same time the pawl 13 of the impression cylinder 5 also opens and closes, so the paper 10 is re-held and attached to the lower circumferential surface of the reversing cylinder 7. When each cylinder further rotates and the reversing claw device 24 and the claw 14 of the second impression cylinder 6 open and close facing each other, the paper 10 is gripped by the claw 14 and attached to the circumferential surface of the impression cylinder 6. Ru. Then, when passing between the blanket cylinder 4, a second color printing or additional printing of the same color is applied to the same surface as the first color.

Next, the double-sided printing operation will be explained based on the above-mentioned figures and FIGS. 9 to 11. When switching from single-sided printing to double-sided printing, the reversing claw 25 that gripped the leading edge of the paper 10 during single-sided printing now grips the tail end of the paper, and it is necessary to change the relative position of the impression cylinder 5 with the claw 13. Therefore, in order to do this, the phase of each cylinder on the downstream side including the reversing cylinder 7 and each cylinder on the upstream side including the first impression cylinder 5 is adjusted using an adjustment device (not shown) according to the size of the paper 10. Move it by the size of the paper. In addition, the paper release timing of the cam that opens and closes the pawl 13 of the first impression cylinder 5 is delayed by approximately the same amount as the paper size. Furthermore, when the printing operation is started after the paper tail suction device 63 is activated, the paper edge is held in the claw 13 and the paper side on the blanket cylinder 4 side is held between the blanket cylinder 4 and the first impression cylinder 5, as in single-sided printing. After being released from the grip between the cylinders 4 and 5, the paper 10 on which the printing has been applied is placed on the lower peripheral surface of the impression cylinder 5 until the tail of the paper comes into contact with the reversing cylinder 7, as shown in FIG. be touched. A little before this, the suction lever 46 and the like are rotated to the position shown in FIG. 7 due to the engagement of the cam mechanism and the gear. Further, a moment later, the pawl shaft 21 rotates significantly due to the engagement of the cam mechanism and the gear, and the entire reversing pawl device 24 rotates to the position shown in FIG. At this time, the reversing claw 25 is closed. During the rotation of the reversing claw device 24, the suction lever 46 returns to the position shown in FIG. 6 again when it has avoided the stopper 64 and no longer interferes with each other.

After the above operations are performed instantaneously, the reversing claw device 24 and the paper tail suction device 63 are
When the paper 10 faces the paper trailing edge, the rotary valve opens and connects each air passage of the paper trailing suction device 63 with the air source, sucking outside air through the small holes 59 and 60. It is attracted to the arc-shaped end face of the From now on, while each cylinder rotates approximately 30 degrees, the suction lever 46 rotates again to the position shown in FIG. is in phase with the gripping surface. In this case, since the suction surface and the gripping surface are out of phase in the axial direction, they do not interfere with each other. Then, the reversing claw 25 opens a moment faster than the suction lever 46 reaches the position shown in FIG. 7, and closes at the same time as the suction lever 46 reaches the position shown in FIG. 1st
Figure 0 shows a state in which the tail end of the paper is sucked and held in the reversing claw 25. Adsorption of paper 10 like this,
In the grip, the tail of the paper attracted to the suction plate 58 is not pressed from above, and as it rotates with the body while being suctioned, it bends from the boundary between the suction part and the non-suction part. The paper tries to be torn off, but the suction plate 58 made of a thin elastic material has only its outer periphery stuck to it, and the center part is bag-shaped, so it follows the paper that is about to be torn off, and the small Due to the suction through the holes 59 and 60 and the large coefficient of friction, the tail of the paper is not peeled off from the suction plate 58 and is held in the reversing claw 25 while being suctioned.

In this way, the end of the paper is caught by the reversing claw 25, and at the same time the claw 13 of the first impression cylinder 5 opens and closes to remove the paper 10.
The suction air for the paper tail suction device 63 is cut off. When each cylinder further rotates, the reversing claw 25 rotates together with the reversing cylinder 7 while holding the tail end of the paper, conveying the paper 10 as shown in FIG. 11, and at the same time, the entire reversing claw device 24 enters the state shown in FIG. to return to. As a result of the paper tail being conveyed in this manner, the paper 10 is reversed so that the printed surface is in contact with the circumferential surface of the reversing cylinder 7, and is wound around the reversing cylinder 7. After this, the process is exactly the same as in the case of single-sided printing, and the paper 10 is changed in the grip by opening and closing the reversing claw 25 and the claw 14 of the second impression cylinder 6, and passes between the blanket cylinder 4 and the impression cylinder 6. When printing, printing is applied to the back side, resulting in double-sided printing.

In addition, in this embodiment, the reversing claw device 2 is attached to the reversing cylinder 7.
4 and a paper tail suction device 63, and this reversing cylinder 7 is provided between the front and rear impression cylinders 5 and 6, the present invention is not limited to the number and arrangement of cylinders for reversing, and the reversing claw device. It does not limit the structure etc.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the paper tail suction device for a sheet-fed rotary printing press with a reversing mechanism, a plurality of thin plates made of an elastic material having a large coefficient of friction are mounted on the suction surface of the suction head. By attaching a suction plate with small holes to cover the suction holes on the suction surface, the tail of paper that tries to be torn off from the suction surface when it is suctioned to the suction surface and held in the reversing claw. The thin bag-shaped suction plate follows and suctions through the small holes to prevent paper from being torn off, and the large frictional force suppresses slippage, preventing it from being torn off and reducing the number of paper drops compared to conventional methods. Paper transfer and reversal performance is significantly improved.

[Brief explanation of drawings]

1 to 11 show an embodiment of the paper end suction device for a sheet-fed rotary printing press with a reversing mechanism according to the present invention, FIG. 1 is a side view thereof, FIG. 2 is an enlarged plan view of the suction head, Figure 3 is the AA sectional view of Figure 2,
The figure is a BB sectional view of Fig. 2, Fig. 5 is a plan view before adhesion of the suction plate, Fig. 6 is a sectional view of the reversing mechanism implementing the present invention, and Fig. 7 is a sectional view of the reversing mechanism in which the paper tail is also adsorbed. 8 to 11 are operation explanatory diagrams, and FIG. 12 is a cylinder arrangement diagram of a conventional sheet-fed rotary printing press with a reversing mechanism. 7... Reversing cylinder, 10... Paper, 25... Reversing claw,
46... Suction lever, 48... Suction head, 52
... Suction hole, 58 ... Suction plate, 59, 60 ... Small hole, 63 ... Paper tail suction device.

Claims (1)

[Scope of utility model registration request] An elastic material with a high coefficient of friction is used on the suction surface of the suction head, which is located at the head of a suction lever that is rotatably supported on the outer periphery of the reversing cylinder, and which attracts the tail end of the paper to be reversed and holds it in the reversing claw. 1. A paper tail suction device for a sheet-fed rotary printing press with a reversing mechanism, characterized in that a suction plate made of a thin plate having a plurality of small holes is adhered to cover the suction holes on the suction surface.