JPH0315548B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the amount of ink discharged from an ink fountain in a printing press.

A sheet-fed or web-fed rotary printing press is equipped with an inking device that supplies printing ink to a plate mounted on a plate cylinder. It consists of a pot roller that rotates to attach ink to its circumferential surface and rotates around it, and a group of rollers that transfer ink on the circumferential surface of the pot roller while evenly leveling it in each direction and depositing it on the plate surface. Of these, the ink fountain consists of a fountain roller, an ink blade whose tip is supported by a fountain stay that connects the machine frame on both sides and whose tip is in contact with the circumferential surface of the fountain roller, and an ink fountain that closes both ends. It is a container with a triangular cross section surrounded by , and is configured so that the amount of ink output can be adjusted by changing the gap between the tip of the ink blade and the circumferential surface of the fountain roller.

Conventionally, this type of ink fountain adjustment device has been designed to adjust the ink blade and fountain roller by rotating a plurality of fountain keys screwed in parallel in the longitudinal direction of the fountain stay with their tips facing the tip of the ink blade. The gap between each section and the surrounding surface is adjusted, but in the case of screw-type pot keys like this, there are some parts that require fine adjustment, and most parts that are only used when attaching and detaching. All screw pitches are the same, and the amount of movement of the pot key relative to the number of rotations is the same, so if the screw pitch is set finely to match the fine adjustment, it will take a long time to attach and detach, and the screw pitch is also easy to attach and detach. A drawback of coarse settings is that fine adjustments cannot be made.

Therefore, as an alternative to this, the pot key is slidably supported on the pot stay, and a cam with a cam surface facing the shaft end is provided on the end surface of the pot, and by rotating the cam, the pot key is moved forward and backward. was proposed, but with this device, not only was it not possible to obtain fine adjustment reproducibility in terms of processing accuracy, and smooth movement could not be obtained due to sliding friction.
There was a drawback that the adjustment position, that is, the value of the ink output amount could not be accurately determined.

The present invention has been made in view of the above points, and includes a pot key that is slidably supported on a pot stay, is biased by a spring member in a direction away from the ink blade, and is attached to the opposite end of the ink blade. At the same time, a T-shaped lever is pivotally mounted, one end of this lever is supported on the pot stay side, and the other end is placed in contact with the cam surface of the cam, and the pot key is moved forward and backward through the lever by rotation of the cam. This makes it possible to adjust the ink output amount with smooth movement with high precision and excellent reproducibility, and also provides a scale to display the rotational position of the cam to adjust the ink output for each section. To provide an ink fountain adjustment device for a printing press that can quickly and accurately adjust the amount of ink output corresponding to the pattern of printed matter by being configured to accurately grasp the amount. Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

1 to 4 show an ink fountain adjusting device according to the present invention, FIG. 1 is a side sectional view thereof, FIG. 2 is a front view from A in FIG. 1, and FIG. 3 is a BB in FIG. 1. The sectional view and FIG. 4 are a front view taken from C in FIG. 1 with the cover removed. In the figure, in front of the pot roller 1 which is pivoted by machine frames on both sides and rotates in the direction shown by arrow D in the figure, there is a main body 2a whose both end surfaces are fixed to the inner surface of the machine frame, and a main body 2a which is fixed to the inner surface of the machine frame. A plurality of partition walls 2 fixed at regular intervals with bolts 2b
A pot stay 2 consisting of c is installed between the frames on both sides. A blade stand 3, which is approximately the same length as the pot stay 2, is integrally fixed to the inclined upper surface of the pot stay 2 with bolts 4.
An ink blade 5 made of an elastic thin steel plate and having approximately the same length as the blade stand is fixed at its base with its tip facing the circumferential surface of the pot roller 1. Further, both ends of the gutter-like portion formed by the ink blade 5 on the circumferential surface of the pot roller 1 are closed with triangular ink wells 6, thereby creating an ink pot 8 that stores ink 7 for printing. is formed. As the pot roller 1 rotates, the ink 7 flows out from the gap between the circumferential surface of the roller 1 and the tip of the ink blade 5, which is indicated by the symbol t in the figure, due to the wedge action between the circumferential surface of the pot roller 1 and the ink blade 5. is configured to adhere to.

In the main body 2a of the pot stay 2, a stepped key hole 9 consisting of a large diameter part and a small diameter part is located between each partition wall 2c and is bored at an angle of approximately 45 degrees with the ink blade 5. A pot key 10 is slidably supported in the key hole 9 with its tip facing the tip of the ink blade 5. This pot key 10 includes a collar 10a that fits into the large diameter portion of the key hole 9, and a bifurcated support piece 10b that projects from the collar 10a.
It is biased in a direction away from the ink blade 5 by a compression coil spring 11 loaded between the collar 10a and the stepped portion of the keyhole 9. In addition, urn key 1
A strip-shaped lever 12 with one end formed into a bifurcated shape is pivotally attached to the support piece 10b of 0 by a pin 13 so as to be substantially orthogonal to the pot key 10 so as to form a T-shape. A roller 14 formed of a ball bearing is pivotally attached to the bifurcated portion by a pin 15.

Reference numeral 16 denotes a support roller consisting of a small diameter portion 16a rotatably supported by the partition wall 2c and a large diameter portion 16b eccentric to the small diameter portion 16a.
7 is fixed to the partition wall 2c, and the large diameter portion 16
One end of the lever 12 is compressed by the coil spring 1 on the circumferential surface of b.
The lever 12 is supported against the elastic force of the lever 12, and when the nut 17 is loosened and rotated, the support position of the lever 12 is moved by an eccentric action. Furthermore, below the support rollers 16,
The camshaft 18 extending over the entire length of the pot stay 2 is the partition wall 2c.
The camshaft 18 has a plurality of cam surfaces on its outer periphery that are made up of a small diameter part 19a, a large diameter part 19b, and an adjustment part 19c that connects them with a gentle curve. A cam 19 is rotatably fitted in correspondence with each roller 14.
The cam 19 can be adjusted by gripping and rotating an adjustment lever 20 protruding forward, so that the adjustment portion 19c of the cam surface is adjusted to the roller 14.
The jar key 10 is moved forward and backward by swinging the lever 12 via the lever 12, and the front surface of the jar stay 2 is covered with a cover 23 having a guide groove 21 from which the adjustment lever 20 is protruded and a scale 22. Therefore, it is configured to display the rotational position of the cam 19. Further, a piece 25 is loaded in the spring hole provided in the cam 19 to push out the camshaft 18 with the elastic force of the compression coil spring 24 and to softly brake the cam 19 with the frictional force.

The operation of the ink fountain adjusting device configured as above will be explained. The ink 7 stored in the ink fountain 8 flows out from the gap t between the circumferential surface of the fountain roller 1 and the ink blade 5 as the fountain roller 1 rotates.
Adheres to the surrounding surface. To adjust the ink output amount, the user grasps the adjustment lever 20 and rotates the cam 19 against the braking force of the piece 25. For example, when the adjustment lever 20 is rotated counterclockwise from the position shown in FIG. 1, the roller 14 moves to an adjustment portion 19c that slopes upward from the small diameter portion 19a to the large diameter portion 19b.
It moves to the right in the figure by the action of . At this time, lever 1
Since the lever 2 and the pot key 10 are urged by the compression coil spring 11 and pressed against the cam 19 and the support roller 16, the lever 12 is pushed by the compression coil spring 11.
1 and rotates counterclockwise in the figure around the support point provided by the support rollers 16. Therefore, the pot key 10 moves to the right in the figure, the gap t becomes smaller, and the ink output amount decreases, and this ink output amount is adjusted to the scale 2 corresponding to the adjustment lever 20.
Displayed by 2. In addition, when increasing the amount of ink output, when the cam 19 is rotated clockwise in the figure, the lever 12 is rotated clockwise in the figure by the elastic force of the compression coil spring 11, so that The key 10 moves in the direction away from the ink blade 5, and the gap t becomes larger.

Next, if you want to change the adjustment range of the ink output amount, loosen the nut 17 that fixes the support roller 16, rotate the support roller 16, and then tighten the nut 17.
When the lever 12 is tightened, the small diameter part 16a and the large diameter part 16b of the support roller 16 are eccentric.
The support position of the lever 12 moves, and the pot key 10 advances and retreats independently of the rotation of the cam 19. Therefore, even if the adjustment lever 20 is similarly rotated between 0 and 10 on the scale 22, the support position of the lever 12 remains unchanged. The adjustment range of the gap t changes accordingly.

FIG. 5 is a side sectional view showing another embodiment of the present invention corresponding to FIG. 1, and in this embodiment,
The support roller 16 in the previous embodiment is not provided, and the end of the lever 12 is pivoted to the partition wall 2c. Instead, the pin 13 at the center of the lever 2 is engaged with the elongated hole 10c provided in the support piece 10b of the pot key 10, so even if one end of the lever 12 is pivoted, the lever 12 will not swing. without interfering with However, in the case of this embodiment, the adjustment range cannot be changed as in the previous embodiment. The rest is the same as the previous embodiment.

As is clear from the above description, according to the present invention, in the ink fountain adjustment device of a printing press, the fountain key is slidably supported on the fountain stay and is biased by a spring member in a direction away from the ink blade. A lever forming a T-shape is pivotally attached to the opposite end of the blade, and one end of this lever is supported on the pot stay side, and the other end is brought into contact with the cam surface of the cam to rotate the cam. By configuring the urn key to move forward and backward through the lever, even if the cam is rotated by a large amount, the movement of the urn key is small due to this principle, and it is also possible to select the pivot position of the lever and adjust the cam curve. Since any adjustment ratio can be obtained by setting, it is possible to finely adjust the ink output amount with extremely high precision and excellent reproducibility, and coarse adjustment of the ink output amount and full opening of the ink blade can all be finely adjusted. Because it can be done quickly with the same cam,
Work efficiency is significantly improved compared to the screw type, and the movement of each part for adjustment is extremely smooth.
Operability can be improved. Furthermore, by providing a scale plate that displays the rotational position of the cam, it is possible to accurately grasp the amount of ink output, so the amount of ink output can be quickly and accurately matched to the pattern of the printed matter. , it is possible to improve the quality of printed matter and work efficiency, and it is extremely easy to reproduce the amount of ink output when the same work is repeated, and the quality of printed matter can be maintained uniformly.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the ink fountain adjustment device for a printing press according to the present invention, in which FIG. 1 is a side sectional view thereof, FIG. 2 is a front view from A in FIG. 1, and FIG. is a BB sectional view of FIG. 1, FIG. 4 is a front view from C in FIG. 1 with the cover removed, and FIG. 5 is a side sectional view of another embodiment of the present invention corresponding to FIG. 1. It is. 1... Pot roller, 2... Pot stay, 5... Ink blade, 10... Pot key, 11... Compression coil spring, 1
2...Lever, 19...Cam, 20...Adjustment lever, 2
2...Scale, 23...Cover.

Claims (1)

[Claims] 1. An ink blade whose base is fixed on the pot stay that connects the machine frames on both sides and whose tip faces the circumferential surface of the pot roller, and an ink blade that slides onto the pot stay with one end facing the tip of the ink blade. a plurality of pot keys which are movably supported and urged in a direction away from the ink blade by a spring member; one end supported on the pot stay side and the other end of the pot keys substantially perpendicular thereto; A pivotably mounted lever, and a cam rotatably supported on the pot stay side with a cam surface facing the other end of the lever, and by rotating the lever, the pot key is moved forward and backward through the lever. and,
An ink fountain adjustment device for a printing press, characterized in that it is provided with a scale that indicates the rotational position of the cam.