JPS6328735B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for engraving the peripheral surface of a roll used for transferring a liquid composition.

In a printing press, ink is transferred from roll to roll. For example, in a gravure printing machine, ink is generally applied to the intaglio cylinder by pressing a doctor knife against the intaglio cylinder. However, when high viscosity ink is used, the ink is first applied to the surface of the convex part of the letterpress cylinder, which has a convex part corresponding to the intaglio cylinder, and then the ink is applied from the convex part of the letterpress cylinder to the concave part of the intaglio cylinder. In some cases, the ink is transferred and finally filled and supplied into the recessed portion and transferred to the printing paper for printing.

Regardless of whether the material to be transferred is ink or a resin solution without pigment, or whether the transfer device is a printing machine or a resin finishing machine for sheets, The peripheral surface of a roll used to transfer such a liquid composition must be finished with an uneven surface so that the composition can easily adhere to the roll. It is said that the sharper and finer the unevenness, the better the transferability.

Conventionally, this type of roll is made by drawing filaments on the circumference of the roll and hand-carving fine grooves alongside the filaments, but there is a limit to how fine the grooves can be, and it requires a high level of skill. There is a problem that it takes a long time to process.

According to another method, as shown in FIG. 1, the roll 1 to be processed is set on a thread-cutting lathe and driven to rotate, and the cutter is moved in the axial direction of the roll while pressing against the roll circumferential surface, thereby cutting the thread. Cut one spiral groove 2 from the right end to the left end of the roll as if cutting a groove, then return the cutter to the right end and leave a certain interval a so as not to overlap the previously cut spiral groove. By repeatedly carving the spiral grooves again, spiral grooves 2 with a constant twist angle are carved leftward and rightward on the roll circumferential surface.

According to this method, the engraving process is automated to a certain extent, but for example, if the engraving process is to be performed on a roll 1 with a diameter of 300 mm and a width of 1000 mm,
In order to carve a spiral groove 2 with a pitch P corresponding to the width of the roll and a helix angle of 45 degrees in leftward and rightward directions with an interval a of 0.5 mm or less, the cutter must be moved left and right approximately 3000 times. Furthermore, each time the cutter is moved, the cutter must be set on the roll circumferential surface by a predetermined gauge a, and in addition, the roll must be
Since it has to be rotated at a low speed of about 0.5 rpm, it takes several tens of hours to finish one roll, and this extremely inefficient process makes engraving rolls expensive and also tends to cause gauge irregularities. There is a problem mentioned above.

The present invention aims to eliminate such inconveniences and provide an engraved roll efficiently and economically, by combining a rotary disk having a peripheral edge with a hard, angular cross section like a knife, and a roll to be processed. , a first step in which the rotary disks are installed so that their axes are not parallel to each other, a second step in which the rotary disk is rotationally driven, and a third step in which the periphery of the rotary disk is pressed against the circumferential surface of the workpiece roll. , a fourth step in which the roll to be processed is driven to rotate so that the peripheral surface of the roll to be processed is in pressure contact with the periphery of the rotary disk and moved across while rubbing the peripheral surface; When moving across the periphery of the rotary disk, the rotary disk vibrates due to friction with the roll to be processed, scraping the circumferential surface of the roll to be processed and carving short grooves on the circumferential surface of the roll to be processed. However, the circumferential surface of the roll to be processed is scraped off by the rotary disk to the extent that continuous grooves are not cut on the circumferential surface of the roll to be processed by the periphery of the rotary disk.
The gist of this method is to engrave the circumferential surface of the roll by following these five steps, including the fifth step of adjusting the pressure force between the circumferential edge of the rotary disk and the circumferential surface of the roll to be processed.

According to the present invention, on the circumferential surface of the workpiece roll in contact with the rotary disk, short groove pieces are intermittently carved in the direction of rotation of the circumferential edge of the rotary disk in the shape of stepping stones in the movement direction of the circumferential surface of the workpiece roll. will be established.

For this reason, while the periphery of the rotating turntable is pressed against the circumferential surface of the rotating workpiece roll, the turntable can press either one of the workpiece rolls or both the turntable and the workpiece roll. When the roll to be processed is gradually moved parallel to the axial direction (feeding is applied), these short groove pieces are evenly distributed over the entire circumferential surface of the roll to be processed.

Since these countless short groove pieces are arranged parallel to the rotating direction of the rotary disk, the cutter is pressed against the circumferential surface of the rotating workpiece roll using the conventional method. The appearance is as if a large number of continuous spiral grooves 2 were carved at fine pitches a while moving in the axial direction of the roll to be processed.

In other words, according to the present invention, the cutter is set on a thread cutting lathe and driven to rotate, and a cutter with a sharp end is pressed against the roll circumference while moving in the axial direction of the roll to cut a thread groove on the roll circumference. Carve a single engraved spiral groove from the right end to the left end of the roll, then move the cutter to the right end and carve the spiral groove again at a certain interval so as not to overlap the previously carved spiral groove. By repeating the engraving process, it is possible to obtain a roll with a circumferential engraving that is essentially the same as a roll in which spiral grooves with a constant helix angle are engraved on the circumferential surface in leftward and rightward directions. .

Hereinafter, referring to the drawings, numeral 4 denotes a circular cutter that is driven to rotate, the peripheral edge 5 of which is a pointed cross-section made of a hard material like a knife, and a workpiece roll 3 that is driven to rotate. is pressed against the peripheral surface 6 of. The axis Q-Q of the circular cutter 4 is at a constant angle θ with respect to the axis O-O of the workpiece roll 3.
It is sloping. Therefore, the circumference 5 of the circular cutter
is inclined by an angle θ from the rotational direction A of the roll to be processed.

The pressing force between the peripheral edge 5 of the circular cutter 4 and the peripheral surface 6 of the workpiece roll 3 is generated when the workpiece roll 3 rotates and its peripheral surface 6 moves across the peripheral edge 5 of the circular cutter 4. The circumferential edge 5 is adjusted to such an extent that continuous cutting grooves in the rotational direction of the roll 3 are not cut into the circumferential surface 6.

Further, when the diameter of the work roll is D, the circular cutter 4 is fed parallel to the axis O-O of the work roll at a distance b that is sufficiently smaller than πDtanθ per revolution of the work roll 3. It is set up so that it can be used.

When the circular cutter 4 and the workpiece roll 3 are driven by adjusting the pressure contact force, the crossing angle θ, and the feed speed in this way, surprisingly, a continuous groove is formed in which the circular cutter follows the rotational direction A of the workpiece roll. zu, that is,
Continuous grooves such as spiral grooves cannot be formed, but fine and short groove pieces 7, such as those carved when repeatedly scraping the circumferential surface of a rotating work roll with a circular cutter, have a constant width c.
They are arranged like stepping stones with an interval d between them.

In such a short groove piece 7, the circumferential edge 5, which is the cutting edge of the circular cutter 4, has an arc shape and cantilever shape and is in pressure contact with the roll circumferential surface 6. When subjected to strain stress, either the circular cutter, the cutter holder, or the roll bearing is elastically strained, and when the strain reaches a certain amount, it acts between the peripheral edge 5 and the roll peripheral surface 6. Vibrations occur in which the peripheral edge 5 returns to its original position by overcoming the frictional force, and as a result, a series of fine traces are formed, such as those made when the peripheral surface of a workpiece roll is repeatedly scraped with a circular cutter. It will be established.

The length c of this short groove piece 7 is equal to the length c of the circular cutter 4.
is directly proportional to the diameter of

Moreover, the interval d between the short groove pieces 7 is
It is directly proportional to the diameter of the roll 3 and inversely proportional to the rotation speed of the roll 3 to be processed. Therefore, installing a continuously variable transmission is convenient for adjusting the distance d between the short groove pieces 7.

In addition, the short groove piece 7 is a circular cutter (rotary disk) 4.
The faster the rotational speed of the cutter, the sharper the cutting will be. For example, if the diameter of the circular cutter 4 is 110 mm, the rotational speed should be set to 6000 rpm or more.

When the circular cutter 4 is moved parallel to the axis O-O of the roll to be processed while the roll to be processed 3 is rotated, the short groove pieces 7 that are consecutively arranged in this way are circular cutter 4
A stepping stone-like band 8 of a pitch b corresponding to the feed distance is formed.

Here, if the feed distance b of the circular cutter 4 per roll rotation is set to be approximately the same as the length c of the short groove piece 7, then the adjacent stepping stone bands 8 and 8'
As shown in Fig. 4, the short groove pieces 7, 8, 8', 8'', etc.
7′, 7″, etc. are consecutive.

By the way, these short groove pieces are attached by the inclined cutter peripheral edge 5, and the peripheral edge 5
are inclined at the same angle as the inclination angle θ, and the short groove pieces 7, 7', of the adjacent stepping stone-like bands 8, 8', 8''...
7''..., a spiral groove 9 with a twist angle of θ, that is, a pitch of πDtanθ, is formed with a fine gauge d.

The pitch P of this spiral groove 9 can be set arbitrarily by simply changing the inclination angle θ of the circular cutter 4. Therefore, by setting θ=90°, the axis of the roll O
It is also possible to carve grooves parallel to -O, and the gauge d between the spiral grooves can be adjusted freely by changing the rotational speed of the work roll 3 with a continuously variable transmission, so the pitch P and gauge d can be adjusted freely. Processing efficiency is not affected by size.

Then, by changing the inclination angle θ between the axis Q-Q of the circular cutter 4 and the axis O-O of the workpiece roll 3 and carving such short groove pieces 7 leftward and rightward, twisting can be prevented. Spiral groove 9 with angle θ and twist angle π−θ
A diamond-shaped mesh pattern can be engraved with the spiral grooves 9'.

As shown in FIG. 5, the rotary disk 4 has a circumferential edge section a having an isosceles triangular cross section, a scalene triangular shaped disk b,
A double peak c, a rectangular one d, or
A serrated type as shown in Figure 6 (however, the tip of the tooth is 10
(The spacing is finer than shown in the diagram), and other rotating grindstones 1
1 can also be used.

The shape of the short groove pieces 7 is discontinuous in accordance with the spacing of the tooth tips 10 when the rotary disk 4 is serrated, and continuous when the rotary disk 4 is a circular cutter or the like. When using the grindstone 11 having the shape shown in FIG. 5d, the corner of the periphery is pressed against the roll circumferential surface as shown in FIG. 7.

Thus, according to the present invention, the spiral groove or mesh pattern is engraved by one movement of the cutter 4 from one end of the workpiece roll 3 to the other end, thereby significantly speeding up the engraving process of the roll.

Furthermore, by changing the holding method (extrusion length, etc.) of the cutter 4, it is possible to adjust the interval d between the short groove pieces 7, which is necessary for forming a beautiful spiral groove 9. It is easy to make adjustments to make the short groove pieces 7, 7', 7'' of the adjacent stepping-stone bands 8, 8', 8'' continuous.

Next, the present invention will be explained in more detail with reference to Examples.

(Example) A rotary grinding wheel (diameter 100 mm) 11 with a cutting edge with a cutting edge angle of 90° and an acrylic grinder with a JIS rubber hardness of 70°.
Nitrile butadiene rubber roll (diameter 300mm,
Width 1000mm) 3 and their axes Q-Q and O-O
Rotary grinding wheel 1
1 is rotated at 12,000 rpm, and while its peripheral edge 5 is in pressure contact with the peripheral surface 6 of the rubber roll to be processed, the rubber roll to be processed is driven to rotate at 12 rpm. The pressure contact force between the circumferential edge 5 of the rotary disk and the circumferential surface 6 of the roll is adjusted so as not to be cut into the circumferential surface of the rubber roll to be processed, and the grinding wheel is rotated at a constant speed in the axial direction O-O of the rotary grinding wheel and the rubber roll to be processed.
The roller was fed at a rate of 50 mm/min, and short groove pieces 7 were cut on the peripheral surface 6 of the roll.

This short groove piece 7 is formed in the axial direction O-O of the roll.
45° twist, depth of cut 0.2mm, groove depth 0.1mm, groove spacing
A stone-like band 8 with a thickness of 0.8 mm was cut on the entire surface of the roll. Then, the adjacent stepping stone bands 8 and 8',
8' and 8''... There is no gap between them, and the short groove pieces 7, 7', 7''... of the adjacent stepping stone-like bands 8, 8', 8''... are continuous, and the groove interval is 0.8 mm and the angle is 45 degrees. A fine spiral groove 9 with a helix angle of was formed on the entire surface of the rubber roll to be processed.

Next, the rotary grinding wheel and the rubber roll to be processed (diameter
300mm, width 1000mm) were installed so that their axes intersected at 135°, and short groove pieces were cut in the same way to create a fine spiral groove with a groove interval of 0.8mm and a helix angle of 135°. was able to be applied to the entire surface of the rubber roll to be processed.

In this way, a mesh pattern was created in which a large number of spiral grooves having a helix angle of 45° intersect with a number of spiral grooves having a helix angle of 135°.

The resulting roll has a large coefficient of friction and is difficult to slip, and has improved liquid pumping and painting capabilities as a fancier roll, making it possible to pump and apply large amounts of liquid.

As is clear, according to the present invention, a uniformly engraved roll can be obtained by simply reciprocating the cutter-like rotating disk once from one end of the rubber roll to the other (approximately 40 minutes in the above example). This is extremely advantageous because the processing time is significantly shortened.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a roll showing the state of engraving on the circumferential surface of the roll, which is the object of the present invention; FIG. 2 is a partial perspective view of the roll showing the state of engraving on the circumferential surface of the roll in an embodiment of the present invention; Figure 3 is a partial sectional view of Figure 2;
FIG. 4 is a partially enlarged front view of the peripheral surface of a roll according to an embodiment of the present invention, FIG. 5 is a cross-sectional view illustrating a rotary disk used in carrying out the present invention, and FIG. 6 is a rotation with a sawtooth peripheral edge. FIG. 7, which is a plan view of the board, is a partial sectional view of the roll showing the engraving process on the peripheral surface of the roll in an embodiment of the present invention. 3...roll, 4...rotary plate, 5...periphery, 7
...Short groove piece, 9...Spiral groove.

Claims (1)

[Scope of Claims] 1 (1) A rotary disk having a peripheral edge with a hard, angular cross section like a knife and a workpiece roll are installed so that their axes are not parallel to each other; (2) (3) Pressing the peripheral edge of this rotary disk against the circumferential surface of the roll to be processed; (4) Driving the roll to be processed so that the circumferential surface of the roll to be processed is rotated. (5) When the peripheral surface of the roll to be processed rotates so as to rub and cross the periphery of the rotary disk, The rotary disk vibrates due to friction with the roll to be processed, scrapes the circumferential surface of the roll to be processed, and carves short grooves on the circumferential surface of the roll to be processed. A method for engraving the circumferential surface of a roll, comprising: adjusting the pressing force between the circumferential edge of the rotary disk and the circumferential surface of the roll to be processed to such an extent that the surface is not scraped off.