JPH023873Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a water supply device for supplying dampening water to a plate on a plate cylinder in a rotary printing press.

[Prior art]

In the lithographic printing method, the basis of the image is created on the surface of a hydrophilic-treated planographic plate by transfer platemaking or photolithography, then chemically treated to create a plate, and this plate is mounted on a plate cylinder. Then, printing is performed while supplying ink and dampening water to the surface. By doing this, the dampening water is repelled in the fatty printed area, and water is absorbed in the water-absorbing non-printed area, so that the supplied fatty ink does not adhere to the printed area. An image is formed by being repelled by the non-image area, and this image is transferred to printing paper and printed.

In a rotary printing press that performs such lithographic printing, the water supply device that supplies dampening water to the plate surface is a water supply device that supplies dampening water to the plate surface. Conventionally, an intermittent water supply type has been widely used, in which water is transferred to a swinging roller by a transfer roller that reciprocates between the rollers and leveled, and then supplied to the plate surface by a bathing roller.

However, with this type of intermittent water supply device, water is supplied intermittently due to the reciprocating movement of the transfer roller, which tends to cause uneven water supply, which causes differences in the amount of ink adhering to the printed matter. As an alternative to this, a continuous water supply device was developed that continuously supplies water without reciprocating the transfer roller. Various types of continuous water supply devices are used. A device known as a typical example is a water fountain roller that rotates in a water tank that stores dampening water, and a plate cylinder that is arranged so that the peripheral surfaces thereof are in sequential contact with each other. It is equipped with a metering roller, a swinging roller, and a bathing roller.
In such a device, the dampening water in the water tank is pulled up by the rotation of the water base roller, and the thickness of the water film is adjusted by the metering roller, and then transferred to the swinging roller, and then transferred to the swimsuit roller. and is supplied to the printing plate on the printing cylinder.

In such a continuous water supply device, the rollers are separated from each other to cut off the transfer of dampening water before printing starts or during non-printing due to interruption.
Generally, the water source roller and metering roller are configured so as not to be separated from each other. However, when printing is interrupted for a long time, such as during a lunch break, if the water base roller and metering roller are kept facing each other and stopped rotating, the rubber coated on the metering roller may be dented. In many cases, the rollers may deteriorate or deteriorate, causing printing failures, so the printing operation has to be stopped while the rollers are still rotating, resulting in wasted power consumption. However, if the water base roller and metering roller are separated, the nip pressure between the two rollers changes each time in conventional equipment, and it is necessary to re-determine this nip pressure when printing operations are restarted. This not only reduces work efficiency, but also increases the amount of waste paper that is produced until regular printed matter is obtained.

[Summary of the idea]

The present invention was developed in view of the above points, and includes a metering roller that is pivoted on a swinging arm so that it can move toward and away from the roller on the downstream side, and a metering roller that swings so that it can move toward and away from the metering roller. A water head roller that is pivotally supported by a movable roller arm, an adjustment screw that telescopically connects the free end of the roller arm and the support member on the machine body side through screw fitting, and a screw that is mounted on the adjustment screw. By providing a spring member that biases the roller arm toward the roller contact side and a cam that swings the roller arm and separates the water base roller from the metering roller, the metering roller and the water base roller can be connected to each other. The configuration is such that the water base roller approaches and separates from the metering roller without changing the nip pressure before and after the movement, and readjustment of the nip pressure reduces work efficiency and increases the amount of paper waste. To provide a water supply device for a rotary printing press that makes it possible to improve the durability of a metering roller without causing damage to the metering roller. Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

〔Example〕

1 and 2 show an embodiment of the water supply device for a rotary printing press according to the present invention, FIG. 1 is a side view thereof, and FIG. 2 is a development of the water base roller and the vicinity of the metering roller shaft end. FIG. In these figures, a frame 1 of the printing unit is pivotally supported by a plate cylinder 2 having a printing plate attached to its circumferential surface and rotating in the direction shown by arrow A in the figures. A plurality of ink forming rollers provided in an inking device (not shown) are removably opposed to each other. On the side of the plate cylinder 2, a swinging roller 3, which has a hydrophilic surface and rotates at the same circumferential speed as the plate cylinder 2 in the direction shown by arrow B in the figure and reciprocates in the axial direction, is pivotally supported on the frame 1. It has been arranged. A lever 4 formed in an L-shape is freely rotatably mounted on the left and right bearings that pivotally support the swinging roller 3. The range of swing is adjustable by the cam 5 and the adjustment screw 6 which can be adjusted forward and backward. The reference numeral 7 indicates an inverted T-shaped roller lever pivotally mounted on the free end of the lever 4, and a bearing 8 integrally formed on the free end of the left and right roller levers 7 on the side of the plate cylinder 2 is provided with a bearing 8. , a swimsuit roller 9 having an elastic surface and rotating in the direction shown by arrow C in the figure due to the contact pressure with the swinging roller 3 is pivotally supported,
Further, a rider roller 10 is pivotally supported by a roller lever 7 and is in contact with the swimsuit roller 9. Furthermore, the other free end of the roller lever 7 is provided with a rod holder 1.
1 is pivotally mounted, and the other end of an adjustment rod 12, one end of which is pivotally mounted to the lever 4, is slidably supported in an insertion hole provided in the protrusion. A compression coil spring 13 is mounted on the adjustment rod 12 to apply rotational force to the roller lever 7 in the counterclockwise direction in the figure.
A double-nut type adjustment nut 14 for adjusting the spring pressure of the compression coil spring 13 is screwed together. The reference numeral 15 is a link shaft that is supported by the frame 1 and rotates in forward and reverse directions due to the expansion and contraction of an air cylinder (not shown). , is connected by a link consisting of an arm 16 fixed to a link shaft 15 and a rod 17 whose both ends are pivotally connected to the arm 16 and the roller lever 7. By doing this, when the air cylinder is operated from the state shown in the figure and the link shaft 15 is rotated counterclockwise, the roller lever 7 and the lever 4 are united by the link movement and rotated around the axis of the swinging roller 3 in the figure. rotate clockwise,
As the swimsuit roller 9 separates from the plate surface of the plate cylinder 2, the lever 4 comes into contact with the eccentric cam 5. When the link shaft 15 continues to rotate after contact, only the roller lever 7 rotates while compressing the compression coil spring 13 while the lever 4 remains stationary, and the swimsuit roller 9 separates from the swinging roller 3. That is, by the continuous operation of the air cylinder, the swimsuit roller 9 is first separated from the plate cylinder 2 and then separated from the swinging roller 3.

Further, diagonally below the swinging roller 3, a pair of left and right lever shafts 18 are rotatably supported on the frame 1 via bearings, and a crank lever 19 and a swing arm are pivotally attached to both protruding parts of the lever shafts 18. 20 restricts movement in the axial direction. At the free ends of the left and right swing arms 20, a metering roller 21 having an elastic surface is mounted on a ball bearing 23 in a bearing 22.
It is rotatably supported via a gear, and is driven and connected to the driving side by a gear to be described later, and rotates in the direction shown by arrow D in the figure. Reference numeral 24 denotes an air cylinder pivotally supported on the side of the frame 1, and the working end of the piston rod is pivotally connected to the free end of the crank lever 19. By expanding and contracting the piston rod, the crank lever 19 and the roller arm 20 are connected. The metering roller 21 is configured to swing toward and away from the swinging roller 3. 25 is frame 1
is screwed into the stud 26 fixed to the nut 2.
This adjustment bolt is fixed at 7, and is configured so that the nip pressure of the metering roller 21 with respect to the swinging roller 3 can be adjusted by rotating the adjustment bolt back and forth. Below both ends of the swinging roller 3, a pair of left and right roller arm shafts 28 connect the flanges with bolts 29.
A roller arm 30 is fixed to the frame 1 and protrudes from the roller arm shaft 28, and a roller arm 30 is freely mounted on the base end of the roller arm shaft 28 so as to be freely rotatable. A water roller 31 having a hydrophilic surface on the free end side of the roller arm 30 and drivingly connected to the driving side by a gear 38 to be described later and rotating in the direction shown by an arrow E in the figure is integrally formed with the roller arm 30. It is pivotally supported via a ball bearing 33 in a bearing 32. A belt pulley 34 and a gear 35 are attached to the driving side roller arm shaft 28 of the pair of roller arm shafts 28.
are integrated with bolts and rotatably mounted via a ball bearing 36, and a timing belt 37 is stretched between the belt pulley 34 and a driving side belt pulley (not shown). Further, the gear 38 that meshes with the gear 35 is mounted on the end shaft of the water head roller 31, and the gear 39 that meshes with the gear 38 is mounted on the end shaft of the metering roller 21. ing. The water base roller 31, which is driven and rotated from the driving side in this manner, is immersed in the dampening water 41 stored in the water cannon 40. The axes are set so that the axis of the lever shaft 18 and the axis of the water head roller 31 when facing the metering roller 21 are substantially coaxial. Reference numeral 42 denotes a bracket as a support member located near the water head roller 31 and fixed to the frame 1 with bolts 43. A stud 44 rotatably supported by the bracket 42 has an adjustment screw in its shaft hole. 45 is slidably supported. The tip threaded portion of this adjustment screw 45 is connected to the roller arm 30.
A double nut 47 is screwed into the screw hole of a stud 46 pivotally attached to the free end of the adjustment screw 45, and a double nut 47 screwed into the threaded portion of the other end of the adjustment screw 45 and the stud 4
A compression coil spring 48 is interposed between the roller arm 30 and the roller arm 4 to apply a rotational force to the roller arm 30 in the direction of drawing the free end of the roller arm 30 toward the stud 44. 49 is the adjusting screw 4 using the dowel pin.
5 is a grooved knob fixed to the stud 44, and a leaf spring 50 fixed to the stud 44 is attached to the outer groove of the knob.
The protrusions are engaged. And this knob 49
By rotating the adjustment screw 45, the adjustment screw 45 moves back and forth within the threaded portion of the stud 46, and the length of the adjustment screw between the free end of the roller arm 30 and the stud 44 expands and contracts. The contact pressure of the adjusting screw 45 is adjusted, and the rotation of the adjusting screw 45 is restricted by the engagement between the leaf spring 50 and the groove of the knob 49. On the other hand, near the free end of the roller arm 30, as shown in FIG. The stud 46 is pivotally mounted, and its outer cam surface is in contact with the protrusion of the stud 46. This cam 51 is rotated by gripping a handle 53 screwed into the cam 51, and the large diameter portion 51b is rotated by the handle 53 which is screwed into the cam 51.
6, the water base roller 31 is separated from the metering roller 21, and by bringing the small diameter portion into contact with the water base roller 31, the water base roller 31 is brought into contact with the metering roller 21. The large-diameter portion 51b of the cam 51 is provided with a recess 51c that engages the stud 46 at the opposing position to restrict rotation of the cam 51.

The operation of the water supply device configured as above will be explained. First, prior to printing, the adjustment screw 6 is rotated to adjust the contact pressure of the swimsuit roller 9 against the plate surface, and the adjustment nut 14 is rotated to adjust the nip pressure of the swimsuit roller 9 against the swinging roller 3. Further, when the adjusting bolt 25 is rotated, the swinging range of the swinging arm 20 changes, and the nip pressure of the metering roller 21 with respect to the swinging roller 3 is adjusted. Further, when the adjustment screw 45 is turned with the knob 49,
The roller 30 is attached to the roller arm shaft 28 by screw action.
The nip pressure of the water base roller 31 relative to the metering roller 21 is adjusted. After adjusting the nip pressure between the rollers in this way, the air cylinder (not shown) connected to the link shaft 15 and the air cylinder 24 are operated, and the cam 51 is rotated with the handle 53. Small diameter portion 51
When the roller a is placed to face the stud 46, all the rollers 2, 9, 3, 21, and 31 come into contact with each other, and the printing operation begins. At this time, the small diameter portion 5 of the cam 51
1a and the stud 46 are separated from each other, and the knob 49 is in contact with the stud 44.
The nip pressure of both rollers 21 and 31 adjusted by is maintained.

When the work starts, a part of the dampening water 41 in the water boat 40 is pulled up as a water film by the water head roller 31 rotating in the direction of arrow E, and is drawn between the water metering roller 21 and the water head roller 31. A portion is pushed out by the nip pressure between 31 and metering roller 21,
The rest falls and is returned to Mizifune 40. Further, half of the extruded water film adheres to the metering roller 21 and is transported, and half adheres to the water source roller 31 and is transported to the water boat 40.
be returned to. The dampening water 41 carried while repeating such transfer is smoothed during the transfer and is supplied to the plate surface on the plate cylinder 2 by the dampening roller 9.

Then, when the printing work is finished or when the printing work is interrupted for a long time during a lunch break, etc., the air cylinder connected to the link shaft 15 is activated by a push button operation or a signal from the timing regulating device. The link movement moves roller lever 7 and lever 4.
1 rotate clockwise in FIG. 1 about the axis of the swinging roller 3, so that the swimsuit roller 9 is separated from the plate surface and the tip of the lever 4 comes into contact with the eccentric cam 5. Link shaft 1 after contact
5 continues to rotate, only the roller lever 7 rotates while compressing the compression coil spring 13 while the lever 4 remains stationary, so that the swimsuit roller 9 separates from the swinging roller 3. Next, the air cylinder 24
is activated, and the swinging arm 20 rotates counterclockwise in FIG. 1 about the lever shaft 18, so that the metering roller 21 is separated from the swinging roller 3. in this case,
Since the axial center of the lever shaft 18 and the axial center of the water base roller 31 facing the metering roller 21 are provided concentrically, the swinging arm 20 rotates and the metering roller 21
Even if it moves, it only rolls on the water head roller 31 and is not strongly pressed against the water head roller 31.

After separating the rollers 9, 3, and 21 in this way, when the handle 53 is grasped and the cam 51 is rotated to bring the large diameter portion 51b into contact with the stud 46, the roller arm 30 is moved by the compression coil spring 48. As the free end rotates in a direction away from the stud 44 against the spring pressure, the water base roller 31 separates from the metering roller 21. Note that stud 46 is cam 5.
Since the roller arm 30 is engaged with the first recess 51c, the roller arm 30 will not rotate due to vibration or the like.

When the printing operation is restarted, the rollers 31, 21, 3, and 9 are brought into contact with each other in the reverse order as described above, and finally the swimsuit roller 9 is brought into contact with the plate surface. To bring the water base roller 31 into contact with the metering roller 21, hold the handle 53 and press the cam 5.
1 is rotated so that the small diameter portion 51a faces the stud 46, the roller arm 30 rotates in a direction in which the free end approaches the stud 44, and the water head roller 3
1 is in contact with the metering roller 21. In this case cam 5
The small-diameter portion 51a of No. 1 is spaced apart from the stud 46, and the knob 49 is in contact with the stud 44.
Therefore, the relative positions of the rollers 21 and 31, that is, the nip pressure, do not change before the printing operation is interrupted and after the printing operation is resumed, and there is no need to readjust the nip pressure after restarting the printing operation. Also, during printing work, both rollers 2
If a foreign object is caught between the rollers 1 and 31, the roller arm 30 rotates while compressing the compression coil spring 48, and the water source roller 31 escapes from the metering roller 21. 30
There is no risk of damage to etc.

4 and 5 are a side view and a developed vertical cross-sectional view of the main parts of another embodiment of the present invention corresponding to FIGS. 1 and 2, and in this embodiment, the adjustment One end of the screw 45 is rotatably supported by a stud 54 implanted in the frame 1, and the free end is fitted into a stud 46 pivotally attached to the roller arm 30. A compression coil spring 4 is mounted on the adjustment screw 45.
8 is located between the double nut 47 and the stud 46, and a knob 4 is attached to the threaded part.
9 are screwed together. The cam 51 is pivotally connected to the frame 1 by a pin 52 as in the previous embodiment, and a handle 53 is screwed into this. The rest is the same as the previous embodiment. By doing this,
Rotation of the knob 49 adjusts the nip pressure of both rollers 21 and 31, and rotation of the cam 51 adjusts the nip pressure of the water base roller 31.
is separated from the metering roller 21 as in the previous embodiment, and the rotation of the cam 51 moves both rollers 2
1 and 31 are brought into contact with each other, the nip pressure before separation can be maintained as in the previous embodiment.

Furthermore, the shape of the cam 51 is such that, for example, as shown in FIG.
Any shape may be used as long as it has a small diameter part and a large diameter part, such as a shape in which the circumferential angle of 1b is increased. In either case, the recess 51
It is desirable to provide c.

Note that the cams 51 may be provided as a pair of left and right or only on one side, but if they are provided on only one side, the water head roller 31 will be tilted when it is separated from the metering roller 21, so the water head roller It is necessary to make the bearing of No. 31 a self-aligning type. However, if it is provided only on one side, the cost is almost halved and the operation time is also reduced to less than half. Also,
The mating member that the cam surface of the cam 51 faces may be a roller instead of the stud 46, and the roller arm 30
It may be made to directly oppose the free end of the.

[Effect of idea]

As is clear from the above explanation, according to the present invention, in the water supply device of a rotary printing press, there is a metering roller that is pivoted on a swinging arm so as to move toward and away from the roller on the downstream side, and a metering roller that is a water roller supported by a roller arm that can freely swing toward and away from the water; an adjustment screw that telescopically connects the free end of the roller arm and a support member on the machine body side by means of a screw fit; By providing a spring member mounted on the adjustment screw to bias the roller arm toward the roller contact side, and a cam that swings the roller arm to separate the water base roller from the metering roller, printing operations can be improved. During long interruptions, the metering roller and water base roller can be separated by simply rotating the handle, so the rubber coating on the metering roller will not be dented or deteriorated. Not only does the durability of the printer improve, but also the operability is extremely good, and since there is no need to keep the metering roller or the like rotating during interruptions in printing operations, power consumption can be reduced. Furthermore, even if the water base roller is separated from the metering roller to interrupt printing work and then returned to its original position when printing work is resumed, the nip pressure between the metering roller and water base roller does not change between before and after the work is resumed. There is no need to readjust the nip pressure, which greatly reduces preparation time, improving work efficiency, and eliminates paper waste that occurs during readjustment, reducing material costs.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the water supply device for a rotary printing press according to the present invention, FIG. 1 is a side view thereof, and FIG. 2 is a developed longitudinal section near the shaft end of the water base roller and metering roller. 3 is a front view of the cam, and FIGS. 4 and 5 are side views and developed longitudinal sections of essential parts showing other embodiments of the present invention corresponding to FIGS. 1 and 2, respectively. FIG. 6 is a front view of a cam as another embodiment of the present invention. 3... Swinging roller, 20... Swinging arm, 21
...Measuring roller, 24...Air cylinder, 30...
... Roller arm, 31 ... Mizumoto roller, 40 ...
Water boat, 41... Dampening water, 44, 46... Stud, 45... Adjustment screw, 48... Compression coil spring, 51... Cam.

Claims (1)

[Scope of utility model registration request] A pair of left and right swinging arms whose base ends are pivotally supported on the machine body side, a metering roller which is pivotally supported at the free ends of these left and right swinging arms, and the swinging arms are swung to perform the adjustment. a driving means for moving the metering roller toward and away from the roller on the downstream side of the water supply path; a pair of left and right roller arms whose base ends are pivoted to the body side on the downstream side of the water supply path of the metering roller; A screw is connected between the water base roller, which is pivotally supported on the free end of the roller arm and immersed in dampening water in the water boat, and the free end of the roller arm and the support member fixed to the machine body. An adjustment screw that is telescopically connected by fitting and swings the roller arm by its rotation to adjust the contact pressure between the water source roller and the metering roller; A spring member is provided at the end of the spring member and biased toward the support member, and the spring member is rotatably supported on the machine body side, and the outer cam surface is brought into contact with the free end of the roller arm so that the water head roller is rotated. A water supply device for a rotary printing press, characterized in that it is provided with a cam that separates the water from the metering roller.