JPH0310044Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cylinder device for wrapping plate-shaped bodies such as printing plates, blankets, and reversing plates around the effective surfaces of various printing cylinders in rotary printing presses.

[Conventional technology]

A rotary printing press is equipped with various printing cylinders such as a plate cylinder, a blanket cylinder, and an impression cylinder, and printing elements such as printing plates, blankets, and reversing plates are wound around the circumferential surface of these printing cylinders. For example, in order to wrap the reversing plate around the circumferential surface of the impression cylinder, one end of the reversing plate is fixed across the entire width to the wall surface of the notch around the cylinder, and
Wrap it around the trunk circumferential surface and guide it to the other end wall surface of the trunk circumference notch. Near this wall, the winding bar is axially mounted parallel to the core of the body, so a reversing plate is inserted into the groove on the circumferential surface of the winding bar, and the winding bar is prevented from reversing by a worm mechanism or a ratchet mechanism. By rotating the reversal plate while holding it tightly, the inversion plate is tightly wrapped around the circumference of the torso.

In addition, depending on the type of barrel, there are those in which the gripping device at one end and the winding bar at the other end are provided in the same notch, or the gripping device at one end and the winding bar at the other end are held by winding bars, and the pair of winding bars are held together by a ratchet mechanism. Some are designed to be tightened by rotating through the .

[Problem that the invention attempts to solve]

However, in such a conventional barrel device, the reversing plate, etc. is tensioned by rotating the winding bar from one end in the axial direction, so even if the rotating bar is rotated, for example, by 20 degrees, it will not be reversed. The winding bar twists due to the tension of the reversing plate, etc., so that it only rotates 15 degrees on the side, and there is a slight difference in tension on both sides in the axial direction, especially in the case of printing plates, etc. This caused a difference in printing register, which affected the quality of printed matter. Therefore, attempts have been made to provide rotating operation means at both ends of the winding bar, but this has resulted in a complicated structure and troublesome operation.

[Means for solving problems]

In order to solve these problems, in the present invention, one end of the plate-shaped body is fixed along the ridge line of the trunk circumference and the other end is wrapped around the trunk surface, and the other end is attached to the trunk circumference parallel to the trunk core. The winding bar is held in a groove in a shaft-mounted winding bar, and a means for rotating the winding bar is provided at one end of the winding bar, and the other end of the groove of the winding bar precedes the rotation operation means in the direction of rotation operation. It was formed at an angle.

[Effect]

With this configuration, one end of the plate-shaped body is fixed and the other end of the plate-like body is wound around the trunk circumferential surface, and the other end is held in the groove of the winding bar, and the winding bar is rotated by the rotation operation means at one end. When the plate-like body is tightened so that it tightly contacts the circumferential surface of the trunk, the twist of the winding bar and the inclination of the groove cancel each other out, so that the groove of the winding bar, that is, the edge of the plate-like body, does not slope and follows the ridge line of the body circumference. It becomes straight.

〔Example〕

This embodiment shows an example in which the present invention is applied to an impression cylinder of a sheet-fed rotary printing press with a reversing mechanism, and FIG. Figure 1 is the AA sectional view, Figure 3 is the front view of the winding bar,
FIG. 4 is a side view of a sheet-fed rotary printing press with a reversing mechanism. In the figure, the paper feed device 2 of the printing press 1 is
It is equipped with a paper stacking platform 4 that automatically lifts up after loading paper.
The papers 3 are suctioned one by one by a suction device (not shown) above the paper 3 and sent onto the difference plate 5. The printing unit 6 for front printing includes a plate cylinder 7 equipped with a printing plate on its circumferential surface.
and an inking device and water supply device (not shown) that supply ink and dampening water to the surface of the printing plate,
Opposed to the plate cylinder 7 is a blanket cylinder 8 around which a blanket is wrapped around which an image formed on the printing plate with ink and dampening water is transferred. Reference numeral 9 denotes an impression cylinder disposed opposite to the rubber cylinder 8, which is equipped with a claw in a notch around the cylinder. By passing between the paper 3 and the cylinder 8, printing pressure is applied to print on the surface of the paper 3.
Between the printing unit 6 for front printing and the printing unit 11 for back printing, there is a transfer cylinder 12 and a double diameter transfer cylinder 1.
3 and a reversing cylinder 14 are disposed in opposition to each other in this order, and the front-printed paper 3 is turned inside out while being picked up in this order. That is, the paper 3 transferred from the transfer cylinder 12 to the double-diameter transfer cylinder 13 and attached to the upper half thereof is transferred to the double-diameter transfer cylinder after the gripping end passes the point of contact with the reversing cylinder 14. The paper 3 is attached to the lower half of the paper 3, and the paper 3 is turned inside out by holding the tail of the paper in the reversing claw of the reversing cylinder 14 and rotating in the direction of the arrow. Printing unit 11 for back printing
A plate cylinder 7 and a blanket cylinder 8 having the same configuration as the printing unit 6 are disposed, and the blanket cylinder 8 is equipped with a pressure for back printing, which will be described in detail in FIGS. 1 to 3. The cylinders 15 are arranged with their peripheral surfaces facing each other. Then, the paper 3 that has been reversed by the reversing cylinder 14 is picked up by the claws of the impression cylinder 15, and as it passes between the blanket cylinder 8, the back side is printed, and the paper 3 is attached to the lower half of the impression cylinder 15. . A pair of left and right sprockets 17 are coaxially arranged with the paper discharge cylinder 16 provided below and in opposition to the impression cylinder 15.
A paper ejection chain 20 having a paper ejection claw is stretched between the sprocket 17 and the sprocket 19 of the paper ejection device 18.
The printed paper 3 is transferred to the impression cylinder 1 by the cooperation of the paper delivery cylinder 16.
After the paper is transferred from the claw of No. 5 to the paper ejection claw of the paper ejection chain 20 and transported by the movement of the paper ejection chain 20, it is released from the grip and the ejected paper is stacked on the paper stacking table 21.

The impression cylinder 15 for back printing includes a cylinder body 15a, disc-shaped bearers 15b at both ends thereof, and shafts 15c at both ends.
The trunk body 15a is provided with a notch 15d extending over its entire length.
The claw shaft 22, which is mounted in parallel with the body core within this notch 15d, is connected to the bearer 15b on both sides and the notch 15d.
A plurality of pawls 23 for holding the paper are fixed in parallel on this pawl shaft 22. Further, on the wall surface of the notch 15d, a nail base 24 that holds the paper 3 between the nail 23 and the nail base bar 2 is provided.
A cam mechanism (not shown) for opening and closing the pawl 23 is provided at the end of the pawl shaft 22.

A reversing plate 26 is wound around the effective surface of the impression cylinder 15 excluding the notch 15d, which is the circumferential surface thereof, to prevent staining of the front printing surface.
One end of the reversing plate 26 is fixed to the wall step of the notch 15d by the nail rest bar 25, and then bent along the wall edge which is the ridgeline of the body, and wrapped around the body circumferential surface to form the notch 15d. is guided to the other wall edge of the Near this wall, there is a winding bar 27.
is rotatably supported by bearers 15b at both ends in parallel with the core of the body, and a cut groove 28 is provided on its circumferential surface over the entire length, and the other end of the reversing plate 26 is inserted into this cut groove 28. has been done. A worm foil 29 is pivotally attached to a protrusion from one of the bearers 15b of the winding bar 27, and the bearer 15
A worm 30 that engages with the worm wheel 29 and constitutes a rotation operating means for the winding bar 27 is supported on b. By rotating the worm 30, the winding bar is rotated through engagement with the worm wheel 29. 27 rotates while being restricted from reversing, and the reversing plate 26 is tightened and wound around the circumferential surface of the trunk.
Then, a cut groove 28 into which the reversal plate 26 is inserted.
is inclined so that the other end side is ahead of the worm wheel 29 side with respect to the rotating operation direction, and in FIG. 3, this inclination angle is indicated by the symbol θ.

In the printing press configured as described above, the sheets of paper 3 fed by the paper feeder 2 onto the differential plate 5 are picked up one by one by the claws of the swing device 10 and transferred to the claws of the impression cylinder 9. When the paper passes between the blanket cylinder 8 and the blanket cylinder 8, printing is applied to the surface. The paper 3 of the printing machine is turned inside out while being changed in the grips of the transfer cylinder 12, the double-diameter transfer cylinder 13, and the reversing cylinder 14 in this order, and is transferred to the claws 23 of the impression cylinder 15, so that the printing surface of the front side is printed. While attached to the circumferential surface of the reversing plate 26, printing is applied to the back surface between it and the blanket cylinder 8. The paper 3 printed on both sides in this way is picked up by the paper ejection claw of the paper ejection chain 20 in cooperation with the paper delivery cylinder 16, and is conveyed along with the movement of the paper ejection chain 20, after which it is transferred to the mouth of the claw. The paper is released from the storage space and discharged and stacked onto the paper stacking table 21.

In such a printing machine, the reversing plate 26
To wrap the plate around the impression cylinder 15, one end of the reversing plate 26 is fixed to the wall surface of the notch 15d with the claw bar 25, and then wrapped around the circumferential surface of the reversing plate 26, and the other end is wrapped around the cut groove of the winding bar 27. 28 and rotate the winding bar 27 via the worm wheel 29 by rotating the worm 30, the reversing plate 2
6 is tightened so that it tightly contacts the circumferential surface of the trunk, and the winding bar 27 is twisted so that the worm foil 29 side leads. However, in this device, the cut groove 29 is inclined so that the opposite side of the worm foil 29 leads. Therefore, this inclination and the twist of the winding bar 27 cancel each other out, and when the tightening is completed, the cut groove 28 becomes straight along the ridge line and parallel to the end held by the claw base bar 25.

As described above, this embodiment shows an example in which the present invention is applied when a reversing plate is wrapped around an impression cylinder, but the same applies when wrapping a blanket around a blanket cylinder or wrapping a printing plate around a plate cylinder. It can be implemented.
5 to 7 are sectional views of the barrel corresponding to FIG. 2, respectively, showing other embodiments of the present invention. First, FIG. 5 shows an example of wrapping a blanket around the blanket cylinder 8 of a sheet-fed printing press as shown in FIG.
In this case, the blanket 31 consists of a pair of wound bars 33 and 34 that are pivoted in a notch 32a of the rubber cylinder 32.
The brackets 31 at both ends are inserted into the cut grooves 35, 36 of the blanket 31, respectively, and the blanket 31 is tightened by rotating both the winding bars 33, 34. In this case, both winding bars 3
The kerfs 35 and 36 of No. 3 and 34 may have an inclination of 1/2 of the inclination angle of the kerf 28 in the above embodiment.

Next, FIG. 6 shows an example of wrapping a printing plate around the plate cylinder of a web-type rotary printing machine. In this case, the printing plate 37
Both ends of the plate cylinder 38 are inserted into the cutout 39 of the plate cylinder 38, and one end of the plate cylinder 38 is inserted into the notch 41 of the winding bar 40. When the winding bar 40 is rotated, both ends of the printing plate 37 are simultaneously pulled into the notch 39 and tightened so as to come into close contact with the circumferential surface of the plate cylinder 38. In this case as well, by slanting the cut grooves 41, the printing plate 3 after installation is
7 are parallel to each other, ensuring good printing registration.

Further, FIG. 7 shows an example in which a printing plate is wound around a plate cylinder of a sheet-fed rotary printing press. In this case, both ends of the printing plate 42 are inserted into a notch 44 of a plate cylinder 43, and one The cap is engaged with the stepped portion in the notch 44, and the cap at the other end is inserted into the cut groove 46 of the winding bar 45. When the winding bar 45 is rotated, the printing plate 42
One end of the plate 42 is wound up and the printing plate 42 is tightened. The fact that the kerf 46 is inclined is the same as in each of the embodiments described above.

In each of the above embodiments, for example in FIG. 3, the inclination angle θ° of the kerf 28 must be changed depending on the thickness, hardness, material, etc. of the printing element to be wrapped, but it can be determined by the following calculation formula. I can do it.

In the figure: T=P/SR θ ₀ =583.6T・x/D ⁴ G ∫xdx=x ² /2 ∫ ^M+N _M (583.6T・x/D ⁴ G)dx =583.6T/D ⁴ G∫ ^{M +N} _M xdx =583.6T/D ⁴ G[ ^x 2/2] ^M+N _M =583.6T/D ⁴ G[(M+N) ² /2-M ^2/2 ] =583.6T/2D ⁴ G(2MN+N ² ) ⁰ In each of the embodiments described above, a worm and a worm wheel are used as the means for rotating the winding bar, but a ratchet mechanism may also be used.

[Effect of idea]

As is clear from the above description, according to the present invention, in the cylinder device of a rotary printing press, one end of the plate-shaped body is fixed along the ridge line of the cylinder circumference and the other end is wound around the cylinder circumference. The winding bar is held by a groove of a winding bar which is mounted on an axis in parallel with the body core, and one end of the winding bar is provided with a rotation operation means, and the groove of the winding bar is rotated at the other end than the rotation operation means. By being formed so as to be inclined in advance with respect to the operating direction, when one end of the winding bar is rotated by the rotation operation means so that the plate-shaped body is brought into close contact with the circumferential surface of the trunk, the tension of the plate-shaped body When the winding bar is twisted, the kerf insertion edge of the plate-shaped body tends to tilt, but this is offset by the inclination of the kerf provided in advance, and the edge of the plate-shaped body becomes parallel to the fixed side edge. Uniform tension can be obtained without the plate-like body becoming loose or twisted, and even in the case of printing plates, good printing register is ensured and the quality of printed matter is improved. Furthermore, the structure is simpler than the conventional one in which the ratchet mechanism is provided at both ends of the winding bar, and it can be provided at low cost.

[Brief explanation of the drawing]

1 to 7 show an embodiment of a cylinder device for a rotary printing press according to the present invention.
Figure 3 is a front view of the winding bar, Figure 4 is a side view of the sheet-fed rotary printing press with a reversing mechanism, and Figure 5 is a cross-sectional view of the sheet-fed rotary printing press with reversing mechanism.
7 to 7 are sectional views showing other embodiments of the present invention corresponding to FIG. 2, FIG. 5 is a sectional view of a blanket cylinder wrapped with a blanket, and FIG. 6 is a sectional view of a printing plate. FIG. 7 is a sectional view of a plate cylinder of a sheet-fed rotary printing press with a web wrapped around it. 1... Printing machine, 7... Plate cylinder, 8... Rubber cylinder, 9
...Impression cylinder, 15...Impression cylinder, 15d...Notch, 2
6... Reversing plate, 27... Winding bar, 28...
...kerf, 29...worm foil, 30...worm, 31...blanket, 32...rubber cylinder,
32a... Notch, 33, 34... Winding bar, 3
5, 36... Cut groove, 37... Printing plate, 38... Plate cylinder, 39... Notch, 40... Winding bar, 41...
...kerf, 42...printing plate, 43...plate cylinder, 44...
Notch, 45...winding bar, 46...cut groove.

Claims (1)

[Scope of utility model registration request] One end of the plate-shaped body is fixed along the ridge line of the trunk circumference and the other end is wound around the trunk surface, and the other end is held by the groove of a winding bar that is mounted on the trunk in parallel with the trunk core. The rotating operation means is provided at one end of the bar, and the groove of the winding bar is formed to be inclined so that the other end side is ahead of the rotating operation means side with respect to the rotation operation direction. cylinder device of a rotary printing press.