JP2005313529A - Dampening arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent occurrence of printing nonuniformity, regarding a dampening arrangement used for an offset press such as a sheet-feed press. <P>SOLUTION: This arrangement has a form roller 5 which is disposed in contact with the surface of a plate cylinder having a notch part for mounting a plate formed and transfers dampening water onto the surface of the plate cylinder, and a leveling roller 6 which is disposed in contact with the form roller 5 and levels the dampening water on the surface of the form roller 5, The form roller 5 itself is driven to rotate in this constitution. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dampening device used in an offset printing machine such as a sheet-fed printing machine.

2 to 6 are views for explaining a conventional dampening device, in which FIG. 2 is a side view thereof, FIG. 3 is a front view of the original roller and a transfer roller, and FIG. FIG. 5 is a top view of the swinging mechanism of the leveling roller, and FIG. 6 is a side view of the roller support structure.
As shown in FIG. 2, an offset printing machine such as a sheet-fed printing machine is generally provided with a dampening device 42 that supplies dampening water to the surface of the plate cylinder 41. The dampening device 42 is mainly configured to include an original roller 3, a transfer roller 4, a landing roller 5, a leveling roller 6, and a water boat 7.

  The landing roller 5 is detachably disposed with respect to the plate cylinder 41, and the transfer roller 4 is detachably disposed with respect to the landing roller 5. Further, the leveling roller 6 is disposed below the contact roller 5 and in contact with the contact roller 5, and the original roller 3 is disposed below the transfer roller 4 and in contact with the transfer roller 4. Further, the former roller 3 is immersed in dampening water stored in the water boat 7. Accordingly, the dampening water stored in the water boat 7 is supplied to the surface of the plate cylinder 41 via the original roller 3, the transfer roller 4, and the landing roller 5. Further, the leveling roller 6 functions to make the dampening water film thickness on the surface of the landing roller 5 uniform.

As shown in FIG. 3, both shafts of the original roller 3 are rotatably supported by bearings 10 and 11 via bearings 14 and 14. The bearings 10 and 11 are rotatably supported by fulcrum shafts 23 and 23 fixed to frames 1 and 2 provided in the machine width direction. The axis centers of the fulcrum shafts 23 and 23 are the same as the axis center of the original roller 3 (that is, the rotation axis center of the bearing 14).
A gear 25 is fixed to the shaft of the original roller 3 on the frame 1 side. The gear 25 meshes with a gear 24 fixed to the shaft on the frame 1 side of the transfer roller 4. As a result, the transfer roller 4 rotates with the same peripheral speed or an appropriate peripheral speed difference as the original roller 3 rotates.

Both shafts of the transfer roller 4 are supported by bearings 10 and 11 via bearings 14 and 14 and eccentric bearings 8 and 8. Thereby, by rotating the eccentric bearings 8 and 8, the center position of the transfer roller 4 with respect to the original roller 3 can be changed, and the contact pressure between the original roller 3 and the transfer roller 4 can be adjusted. Yes.
As shown in FIG. 4, shaft portions (hereinafter simply referred to as shafts) 60 and 61 protruding from both ends of the landing roller 5 are supported by the bearings 12 and 13 via the bearings 14 and 14 and the eccentric bearings 9 and 9. ing. Thereby, by rotating the eccentric bearings 9 and 9, the center position of the landing roller 5 with respect to the leveling roller 6 can be changed, and the contact pressure between the leveling roller 6 and the leveling roller 5 can be adjusted. It has become.

Shaft portions (hereinafter simply referred to as shafts) 62 and 63 projecting from both ends of the leveling roller 6 are rotatably supported by fulcrum bearings 43 and 44 fixed to the frames 1 and 2 via bearings 15 and 15. ing. The bearings 12 and 13 supporting the landing roller 5 are rotatably supported by fulcrum bearings 43 and 44.
The shaft 62 on the frame 1 side of the leveling roller 6 passes through the frame 1 and protrudes to the outside of the frame 1, and the gear 28 is fixed to a portion protruding to the outside of the frame 1. The gear 28 is connected to the shaft of the plate cylinder 41 via a gear train including a plurality of gears (not shown), and the leveling roller 6 is rotationally driven in conjunction with the rotation of the plate cylinder 41. Yes.

A bobbin 36 is fixed to the end of the shaft 62 of the leveling roller 6. A piece 37 is fitted in a groove formed in the bobbin 36, and the piece 37 is fixed to a lever 38. As shown in FIG. 5, the lever 38 is rotatably supported by a shaft 40 on a stand 39 fixed to the frame 1.
The lever 38 is swung by a required angle by a driving device (not shown). When the lever 38 is swung, the leveling roller 6 is swung in the axial direction of the landing roller 5. By swinging the leveling roller 6 in this way, the water film on the surface of the landing roller 5 is leveled so that water unevenness on the surface of the landing roller 5 caused by the difference in water consumption due to the pattern can be reduced. It has become. The swing of the leveling roller 6 is set so as to reciprocate once every two rotations of the plate cylinder 41, for example.

Further, as shown in FIGS. 3 and 6, pins 21 and 21 are fixed to the bearings 10 and 11. Further, the tips of air cylinders 20 and 20 rotatably supported by support columns 22 and 22 fixed to the frames 1 and 2 are rotatably connected to bearings 10 and 11 by pins 21 and 21.
As shown in FIGS. 3 and 6, pins 17 and 17 are rotatably disposed at the bifurcated portions 45 and 45 of the bearings 10 and 11 (only the bifurcated portion 45 of the bearing 10 is shown in FIG. 6). Further, as shown in FIGS. 4 and 6, elongated holes 46 and 46 are formed in the bifurcated portions 45 and 45 of the bearings 12 and 13 (only the bifurcated portion 45 of the bearing 12 is shown in FIG. 6). Pins 16 and 16 are disposed in the holes 46 and 46. A screw hole is formed in each of the pin 16 and the pin 17, and an adjustment screw 18 is screwed into the screw hole of the pin 16 and the screw hole of the pin 17. In addition, the pitch of the screw hole of the pin 16 and the screw hole of the pin 17 is different.

  The bearings 10 and 11 of the original roller 3 and the transfer roller 4 shown in FIG. 3 rotate around the fulcrum shafts 23 and 23, and the bearings 12 and 13 of the landing roller 5 and the leveling roller 6 shown in FIG. 44, the adjustment screw 18 rotates to change the center-to-center distance between the passing roller 4 and the landing roller 5 shown in FIG. The pressure can be adjusted.

  Further, as described above, the bearing 10 and the bearing 12, and the bearing 11 and the bearing 13 are connected by the adjusting screws 18 and 18, respectively, and between the bearing 10 and the bearing 12 (not shown, the bearing 11 and the bearing 13 are not shown). Springs 34 are also provided between the bearings 10, 11, 12, 13 together with the plate cylinder 41 by the movement of the air cylinder 20. . That is, the landing roller 5 can be attached to and detached from the surface of the plate cylinder 41.

  During the above attachment / detachment operation, the bearings 10 and 11 rotate around the axis of the original roller 3, and the bearings 12 and 13 rotate around the leveling roller 6, so the center between the original roller 3 and the transfer roller 4. The distance between the center of the roller 5 and the leveling roller 6 and the distance between the center of the roller 5 and the transfer roller 4 do not change, and the rollers 3, 4, 5 and 6 rotate without any trouble. Can be done.

  Further, as shown in FIG. 6, the protrusion 33 formed on the bearing 12 abuts on the tip of the adjustment screw 19 screwed into the bracket 50 fixed to the frame 1, so that the attachment to the plate cylinder 41 is performed. The contact of the roller 5 is regulated. That is, by adjusting the screwing position of the adjustment screw 19 with respect to the bracket 50, the contact pressure between the plate cylinder 41 and the landing roller 5 can be adjusted. Although not shown, a similar protrusion, bracket, and adjustment screw 19 are also provided on the bearing 13 side.

  Further, as shown in FIG. 3, the motor 29 is fixed to the frame 1, and the gear 25 of the original roller 3 is meshed with the gear 51 attached to the shaft 48 of the motor 29. In other words, the original roller 3 and the transfer roller 4 are driven to rotate by the motor 29. Normally, the leveling roller 6 is driven to rotate at the same peripheral speed as the plate cylinder 41, but the original roller 3 and the transfer roller 4 are rotated at a peripheral speed slower than that of the plate cylinder 41.

Since the contact roller 5 is rotated by the rotation of the leveling roller 6 by contact (frictional force) with the leveling roller 6, it is rotated at the same speed as the peripheral speed of the plate cylinder 41. The dampening water is metered by the difference in peripheral speed at the contact portion between the landing roller 5 and the transfer roller 4.
Since the landing roller 5 rotates faster than the transfer roller 4, the frictional force by the transfer roller 4 is a force to decelerate the landing roller 5, but against this, the frictional force by the plate cylinder 41 is equalized. Due to the frictional force of the roller 6, the landing roller 5 rotates at the same peripheral speed as the peripheral speed of the plate cylinder 41.

A conventional dampening device as described above is disclosed in Patent Document 1, for example.
JP 58-094465 A

  However, since a plate mounting notch 47 is formed in the plate cylinder 41 of the sheet-fed printing machine over the axial direction of the plate cylinder 41, when the landing roller 5 is in a position facing the notch 47, the landing roller 5 is It is not in contact with the plate cylinder 41, and the force for rotating the landing roller 5 is only the frictional force due to the contact between the leveling roller 6 and the transfer roller 4. For this reason, the force to rotate at the same speed as the peripheral speed of the plate cylinder 41 decreases, the influence of the deceleration force of the transfer roller 4 increases, and the peripheral speed of the landing roller 5 becomes slower than the peripheral speed of the plate cylinder 41. Further, when the landing roller 5 passes through the region of the notch 47 and comes into contact with the surface of the plate cylinder 41, the landing roller 5 is accelerated again to the same speed as the peripheral speed of the plate cylinder 41. At this moment, the uniform water film on the surface of the landing roller 5 is destroyed, and a non-uniform water film distribution (different film pressure on the surface of the landing roller 5) occurs on the surface of the landing roller 5.

  Further, in printing paper with a lot of paper dust, it is known that a method of reducing the peripheral speed of the landing roller 5 by several tens percent from the peripheral speed of the plate cylinder 41 is effective in reducing printing trouble due to paper dust. It has been. On the other hand, the peripheral speed of the plate cylinder 41 is uniquely determined, and the peripheral speed of the transfer roller 4 is determined by the amount of metered water, so that the deceleration of the landing roller 5 reduces the peripheral speed of the leveling roller 6. This is realized. The leveling roller 6 can be decelerated by changing the gear train between the plate cylinder 41 and the gear 28 of the leveling roller 6. In this case, since the peripheral speeds of the plate cylinder 41, the transfer roller 4, and the leveling roller 6 are different, the influence of the notch 47 is complicated and it is difficult to ensure the uniformity of the water film on the surface of the landing roller 5.

  As described above, the notch 47 of the plate cylinder 41 causes a non-uniform water film (water unevenness) on the surface of the landing roller 5, and the water unevenness is transferred to the surface of the plate cylinder 41 (that is, the plate surface) and printed unevenly on the printed matter. Will occur. Since printed matter with uneven printing is treated as a defective product, a large amount of wasted paper is generated.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a dampening device capable of preventing the occurrence of uneven printing.

  For this reason, the dampening device of the present invention according to claim 1 is disposed in contact with the surface of the plate cylinder on which a notch for mounting the plate is formed, and a landing roller for transferring dampening water to the surface of the plate cylinder, It is characterized in that it is arranged so as to be in contact with the landing roller, and is equipped with a leveling roller for leveling the dampening water on the surface of the landing roller, so that the landing roller itself is rotationally driven. That is, the landing roller is not directly driven but rotated.

A dampening apparatus according to a second aspect of the present invention is characterized in that, in the apparatus according to the first aspect, the adhering roller is configured to be rotationally driven at the same peripheral speed as the peripheral speed of the plate cylinder.
A dampening apparatus according to a third aspect of the present invention is characterized in that, in the apparatus according to the first aspect, the adhering roller is rotationally driven at a peripheral speed lower than the peripheral speed of the plate cylinder.
A dampening apparatus according to a fourth aspect of the present invention is the apparatus according to any one of the first to third aspects, wherein the leveling roller is configured to swing in the axial direction of the landing roller. It is a feature.

According to the dampening device of the first and second aspects of the present invention, the landing roller can be stably rotated by rotationally driving the landing roller itself. As a result, it is possible to prevent nonuniformity (water unevenness) of the water film on the surface of the landing roller caused by the notch portion of the plate cylinder, and it is possible to prevent the occurrence of print unevenness of the printed matter.
According to the dampening apparatus of the present invention as set forth in claim 3, it is possible to remove deposits such as paper dust existing on the surface of the plate cylinder.

  According to the dampening device of the present invention as set forth in claim 4, the water film on the surface of the landing roller can be made more uniform.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view schematically showing main parts (a landing roller and a leveling roller) of a dampening device according to an embodiment of the present invention. In FIG. 1, the same parts as those in the conventional example described above are indicated by the same reference numerals.
The dampening device according to the present embodiment is provided in an offset printing machine such as a sheet-fed printing machine, and does not rotate the landing roller 5 by contact (frictional force) with the plate cylinder and the leveling roller 6. There is no significant difference (that is, not driven rotation), but the landing roller 5 itself is directly driven to rotate. Hereinafter, the configuration of the landing roller 5 and the leveling roller 6 according to the present embodiment will be mainly described, and the other configurations are the same as those of the conventional example, and the description thereof will be omitted.

  As shown in FIG. 1, the shaft 60 on the frame 1 side of the landing roller 5 is supported by the bearing 12 via the bearing 14 and the eccentric bearing 9, and the shaft 61 on the frame 2 side of the landing roller 5 is supported on the bearing 14. And supported by a bearing 13 via an eccentric bearing 9. The eccentric bearings 9 and 9 are rotatably attached to the bearings 12 and 13, and the center position of the landing roller 5 with respect to the leveling roller 6 can be changed by rotating the eccentric bearings 9 and 9. The contact pressure between the leveling roller 6 and the landing roller 5 can be adjusted. A gear 27 is fixed to the shaft 60 of the landing roller 5.

A shaft 63 on the frame 2 side of the leveling roller 6 is rotatably supported by a fulcrum bearing 44 fixed to the frame 2 via a bearing 15. The bearing 13 supporting the landing roller 5 is rotatably supported by a fulcrum bearing 44.
A shaft 62 on the frame 1 side of the leveling roller 6 passes through the frame 1 and protrudes to the outside of the frame 1, and a cylindrical gear shaft 26 is provided on the outer peripheral surface of the shaft 62 via a bearing 53. . A gear 32 is fixed to one end of the gear shaft 26 on the leveling roller 6 side, and the gear 32 and the gear 27 of the landing roller 5 are engaged with each other.

  Further, a gear 31 is fixed to the other end portion of the gear shaft 26. The gear 31 is disposed outside the frame 1, and here, the shaft of the plate cylinder 41 (for example, see FIG. 2 used in the description of the conventional example) via a gear train composed of a plurality of gears (not shown). It is connected to the. As a result, the rotational power of the plate cylinder 41 is transmitted to the gear 27 of the landing roller 5 via the gear train and the gear shaft 26, and the landing roller 5 is rotationally driven in conjunction with the rotation of the plate cylinder 41. ing. Here, the landing roller 5 is rotationally driven at the same peripheral speed as the peripheral speed (rotational speed) of the plate cylinder 41.

  Further, a cylindrical support bearing 43 is provided on the outer peripheral surface of the gear shaft 26 via a bearing 52. The support bearing 43 is fixed to the frame 1. The bearing 12 supporting the landing roller 5 is rotatably supported by a fulcrum bearing 43.

  Since the dampening device as an embodiment of the present invention is configured as described above, the rotational power of the plate cylinder 41 is transmitted to the gear 31 of the gear shaft 26 via the gear train, and the gear shaft 26 is leveled. It rotates around the axis 62 of the roller 6. When the gear shaft 26 rotates, the gear 27 of the landing roller 5 that meshes with the gear 32 of the gear shaft 26 is rotationally driven, and the landing roller 5 is rotationally driven. Further, the leveling roller 6 rotates in accordance with the rotation of the landing roller 5 by the contact (frictional force) with the landing roller 5 and swings in the axial direction of the landing roller 5.

  In this manner, the landing roller 5 can be stably rotated by rotationally driving the landing roller 5 itself. As a result, it is possible to prevent non-uniformity (water unevenness) of the water film on the surface of the landing roller 5 caused by the notch for attaching the plate of the plate cylinder 41, and it is possible to prevent the occurrence of printing unevenness of the printed matter. . Therefore, it is possible to improve production efficiency because paper is not wasted.

  Further, since the leveling roller 6 swings in the axial direction of the landing roller 5 as in the prior art, the water film on the surface of the landing roller 5 can be made more surely uniform.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the landing roller 5 is configured to be rotationally driven at the same peripheral speed as the plate cylinder 41, but the gear train is changed so that the landing roller 5 is rotated at a peripheral speed slower than the peripheral speed of the plate cylinder 41. You may comprise so that it may rotate. Further, in this case, it is preferable that the landing roller 5 is rotationally driven at a constant speed slower than the peripheral speed of the plate cylinder 41. By comprising in this way, deposits, such as paper dust which exists on the plate cylinder 41 surface, can be removed.

  In the present embodiment, the landing roller 5 is driven to rotate by the gear train, the gear 31, the gear 32, and the gear 27 in conjunction with the rotation of the plate cylinder 41, but the rotation of the plate cylinder 41 (or the printing machine). A driving device such as a motor that is driven and controlled so as to be linked with the speed), and the driving force of the driving device is transmitted to the gear train, and is attached via the gear train, the gear 31, the gear 32, and the gear 27. You may comprise so that the roller 5 may be rotationally driven. Alternatively, a configuration is such that a driving device such as a motor that is driven and controlled in conjunction with the rotation of the plate cylinder 41 (or the printing machine speed) is directly connected to, for example, the shaft 60 of the landing roller 5 to directly rotate the landing roller 5. May be.

It is a front view which shows typically the principal part (attaching roller and leveling roller) of the dampening apparatus which concerns on one Embodiment of this invention. It is a side view which shows the conventional dampening apparatus typically. It is a front view which shows typically the principal part (an original roller and a transfer roller) of the conventional dampening apparatus. It is a front view which shows typically the principal part (formation roller and leveling roller) of the conventional dampening apparatus. It is a top view which shows typically the rocking | fluctuation mechanism of the conventional leveling roller. It is a side view which shows typically the roller support structure of the conventional dampening apparatus.

Explanation of symbols

1 and 2 Frame 3 Original roller 4 Passing roller 5 Landing roller 6 Leveling roller 7 Water boat 8 Eccentric bearing of the passing roller 9 Eccentric bearing of the landing roller 10, 11, 12, 13 Bearing 14, 15 Bearing 16, 17 Pin 18, 19 Adjustment screw 20 Air cylinder 21 Pin 22 Post 23 Support shaft 24, 25 Gear 26 Gear shaft 27, 28 Gear 29 Motor 31, 32 Gear 33 Projection 34 Spring 36 Bobbin 37 Frame 38 Lever 39 Stand 41 Plate cylinder 42 Wet Marking device 43, 44 Support point bearing 45 Bifurcated portion 46 Elongated hole 47 Notch portion of plate cylinder 48 Motor shaft 50 Bracket 51 Gear 52, 53 Bearing 60, 61 Shaft (shaft portion) of landing roller
62,63 Leveling roller shaft (shaft)

Claims (4)

A landing roller disposed in contact with the plate cylinder surface on which a notch for mounting the plate is formed, and transferring dampening water to the plate cylinder surface;
A contact roller disposed in contact with the landing roller and leveling dampening water on the surface of the landing roller;
A dampening device configured to rotationally drive the adhering roller itself. 2. The dampening device according to claim 1, wherein the adhering roller is driven to rotate at the same peripheral speed as the peripheral speed of the plate cylinder. 2. The dampening device according to claim 1, wherein the adhering roller is configured to be rotationally driven at a peripheral speed slower than the peripheral speed of the plate cylinder. The dampening device according to any one of claims 1 to 3, wherein the leveling roller is configured to swing in the axial direction of the landing roller.

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