JPH1058644A - Rotary press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a decrease in printing quality due to a vibration of a cylinder. SOLUTION: A printing pressure A is applied to an impression cylinder 3 opposed to a rubber cylinder 2. First and second vibration suppressing means 7, 8 are provided at the cylinder 2. In the means 7, a roll 20 rotatable at one end of a lever 15 rotatable around a shaft 16 is brought into pressure contact with a bearer 4 by a belleville spring 30. In the means 8, a roll 44 rotatable at one end of a lever 40 rotatable around a round stay 37 is brought into pressure contact with the bearer 4 by a spring 54. A resultant force D of the pressing pressures B and C of the rolls 20 and 44 is opposite in a direction to the pressure A and has the same magnitude as the pressure A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary printing press in which vibration of a cylinder is suppressed.

[0002]

2. Description of the Related Art Generally, in this type of rotary printing press,
On the peripheral surface of the plate cylinder or blanket cylinder, a notch for accommodating a plate vice for mounting a plate or a rubber blanket is provided along the axial direction of the cylinder. For this reason, when the plate cylinder and the blanket cylinder rotate during printing, when the notches face each other, and when the effective surfaces (peripheral surfaces) of the plate cylinder and the blanket cylinder again face each other, the plate cylinder and the blanket cylinder rotate. Vibration occurs in the cylinder, and particularly, the blanket cylinder vibrates greatly, and this causes print streaks on printed matter. Therefore, the present applicant has proposed a technique disclosed in Japanese Patent Application Laid-Open No. 1-2241441 in order to prevent this. The one proposed here has two torso facing each other,
By providing a second bearer inside or outside of a bearing that rotatably supports these cylinders, and by pressing these bearers against each other, the plate cylinder and the blanket cylinder are provided when the notches face each other and after the notches face each other. When the effective surfaces (peripheral surfaces) face each other again, the two bodies are prevented from jumping up to suppress the vibration of the bodies. Even when the notches are not facing each other, the printing pressure required to print between the blanket cylinder and the impression cylinder is applied during printing, so the paper after passing between the blanket cylinder and the impression cylinder A gap corresponding to the thickness of the cylinder occurs, and vibration occurs because the blanket cylinder fluctuates by this gap.
This also causes print streaks on printed matter.

[0003]

Generally, a bearer is set to have extremely high processing accuracy in order to maintain print quality, and it is necessary to suppress the vibration of the cylinder as in the above-described conventional rotary printing press. However, if a structure is adopted in which the bearers are pressed against each other, the bearers will deform due to the vibration due to the presence of the notch, and this accuracy cannot be maintained.Therefore, the print quality will be reduced. There was a problem that a printing failure occurred.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a rotary printing press capable of preventing a print quality from being deteriorated due to a vibration of a cylinder and preventing a printing trouble. Is to provide.

[0005]

In order to achieve this object, a rotary printing press according to the present invention comprises a rotatably supported cylinder and a counterpart rotatably supported in contact with the cylinder. Comprising, a pressing member that contacts the body, and the pressing member,
Urging means for urging the body in a direction away from the other body is provided. Therefore, when the notches of the body and the mating body face each other, the urging means restricts the body from changing in the direction of the mating body.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a main part of the present invention in a rotary printing press, FIG. 2 is a plan view showing an expanded structure of one roller in FIG. 1, and FIG. It is a top view which expands and shows. In these figures, reference numeral 1 denotes a plate cylinder provided with bearers (not shown) at both ends, which accommodates a vice device for adding a starting end and a terminating end of a plate mounted on a peripheral surface. Notches (not shown) are formed on the peripheral surface along the axial direction, and are rotatably supported by a pair of frames 5 and 5 (one frame is not shown) facing each other via bearings. ing.

Reference numeral 2 denotes a blanket cylinder comprising a trunk body provided with bearers 4 at both ends of the trunk body and an end shaft, which houses a vise device for adding a starting end and a terminating end of a blanket mounted on the peripheral surface. A notch (not shown) is formed on the peripheral surface so as to extend along the axial direction, and is rotatable via a bearing on a pair of frames 5, 5 opposed to each other so that the peripheral surface contacts the plate cylinder 1. It is supported by. Reference numeral 3 denotes an impression cylinder having a diameter twice that of the blanket cylinder 2 and having bearers (not shown) at both ends,
A notch (not shown) for accommodating a gripper device for holding paper on the peripheral surface is formed along the axial direction on the peripheral surface,
The pair of frames 5, 5 facing each other so as to be in contact with the blanket cylinder 2 are rotatably supported via bearings.

On the left and right sides of the blanket cylinder 2, there are provided first vibration suppressing means 7 and second vibration suppressing means 8 for suppressing the vibration of the blanket cylinder 2. First, the first vibration suppressing means 7 will be described with reference to FIGS. The first vibration suppressing means 7 includes a corner stay 10 fixed to the frames 5 and 5 so as to be bridged between the pair of frames 5 and 5;
It is held by a bracket 11 fixed to one frame 5. The bracket 11 is provided with a vertical portion 11a that stands upright in a direction perpendicular to the surface of the frame 5 and has a hole 11b.

Reference numerals 13 and 13 denote a pair of support plates, each having a rectangular recess 13a at the upper end and a hole 13b at the bottom. The pair of support plates 13, 1
3, the recess 13 a is fitted into the lower edge of the corner stay 10, and the bolt 14 is inserted through the corner stay 10 from one end of the support plate 13 and screwed into the other end of the support plate 13 to thereby form a corner. The stay 10 is fixed in the longitudinal direction at an interval slightly longer than the thickness of a lever 15 described later.

Reference numeral 15 denotes a lever formed in a substantially U-shape, and has holes 15a, 15a at both ends and a bent portion, respectively.
b, 15c are drilled. The lever 15 is provided with a shaft 1 inserted between the holes 13b, 13b of the support plates 13, 13.
6 is rotatably supported by the support plates 13, 13 via the shaft 16 by inserting the hole 6 into the hole 15 c. The shaft 16 is fixed to the support plate 13 by pins 17, and the support plate 13 is prevented from coming out of the hole 13 b.

A support shaft 19 is fitted into a hole 15a at one end of the lever 15, and a roller 20 which is in contact with the bearer 4 of the blanket cylinder 2 has a bearing (not shown) at one end of the support shaft 19. ), The support shaft 19 is attached to the lever 15 by screwing a nut 21 into a screw portion formed at the other end. A rod 24 having a threaded portion 24a formed at one end is slidably supported in the hole 11b of the bracket 11, and a connector 25 having a hole 25a is fixed to the other end of the rod 24. ing.

A support shaft 26 has a flange 26a at one end and an annular groove at the other end, and is formed in a stepped shape as a whole. The support shaft 26 is inserted into the hole 25 a of the connector 25 and the hole 15 b at the other end of the lever 15, and the retaining ring 27 is attached to the annular groove. Is pivotally connected to the other end of the lever 15.

A sleeve 29 is loosely inserted into one end of the rod 24, and a plurality of disc springs 30 are interposed between the adjustment nut 31 screwed to the screw portion 24 a and the sleeve 29, whereby the sleeve 29 is inserted. Is engaged with the vertical portion 11a of the bracket 11, and the rod 24 is urged in the direction of the arrow by the spring force of the disc spring 30. When the rod 24 is urged in the direction of the arrow, the lever 15
1 rotates counterclockwise in FIG. 1 around the shaft 16, so that the roller 20 presses the bearer 4 in the direction of arrow B. In addition, although illustration is omitted, the first
The vibration suppressing means 7 is also provided on a bearer on the other end side of the blanket cylinder 2.

Next, the second vibration suppressing means 8 will be described with reference to FIGS. The second vibration suppressing means 8 is held by fixed plates 35 fixed to a pair of frames 5, 5, respectively.
Bolts 3 and 5 have support plates 36 and 36 (both are not shown for one frame 5).
8, 38 fixed. A pair of support plates 36,
36, both ends are fixed with bolts 39, 39 so that a round stay 37 is bridged between the frames 5, 5.

Reference numeral 40 denotes a lever formed in a substantially U-shape, and has holes 40a, 40a at both ends and a bent portion, respectively.
b, 40c are drilled. This lever 40 is
By inserting 0c into the round stay 37, the round stay 37 is rotatably supported about the round stay 37 as a center of rotation. 4
Reference numerals 1 and 41 denote ring-shaped stoppers which are fitted into the round stay 37 from both sides of the lever 40, and
The pin 4 is fixed to the round stay 37 by inserting a pin (not shown) through the retainer 41 and the round stay 37 so that the pin has a slight gap with zero.
Restriction of the zero stay from the round stay 37 is restricted.

A support shaft 43 is fitted into a hole 40a at one end of the lever 40. A roller 44 (not shown) is provided at one end of the support shaft 43 so as to be in contact with the bearer 4 of the blanket cylinder 2. ), The supporting shaft 43 is attached to the lever 40 by screwing a nut 45 into a screw portion formed at the other end. 47 is fixed plate 3
A bracket fixed to the vertical portion, the vertical portion being vertically erected with respect to the frame, and having a hole 47b formed therein.
7a is provided. Hole 47b of this bracket 47
On one end, a rod 48 having a threaded portion 48a formed at one end is slidably supported.
The connector 49 having the hole a is fixed.

A support shaft 50 has a flange 50a formed at one end and an annular groove provided at the other end, and is formed in a stepped shape as a whole. The support shaft 50 is inserted into the hole 49a of the connector 49 and the hole 40b at the other end of the lever 40, and the retaining ring 51 is mounted in the annular groove. Is pivotally connected to the other end of the lever 40.

A sleeve 53 is loosely inserted into one end of the rod 48, and a disc spring 54 is interposed between the adjustment nut 55 screwed to the screw portion 48a and the sleeve 53, so that the other end of the sleeve 53 is inserted. The end is engaged with the vertical portion 47 a of the bracket 47, and the rod 4
8 is urged in the direction of the arrow in the figure. When the rod 48 is urged in the direction of the arrow, the lever 40 rotates clockwise in FIG. 1 around the round stay 37 via the support shaft 50, so that the roller 44 moves the bearer 4 in the direction of the arrow C. Press. Although not shown in the drawings, the thus configured second
The vibration suppressing means 8 is also provided on a bearer on the other end side of the blanket cylinder 2.

Here, the pressure applied to transfer the ink to the paper at the time of printing, that is, the printing pressure is always applied to the blanket cylinder 2, and the blanket cylinder 2 and the impression cylinder 3 are applied by the printing pressure.
For example, when the notches face each other, a force is generated that causes the blanket cylinder 2 to move in the direction A in the figure, thereby causing vibration. The pressing force C against the bearer 4 by the roller 44 of the second vibration suppressing means 8 and the roller 20 of the first vibration suppressing means 7,
The resultant force D of B is adjusted so that the direction is opposite to the force A that fluctuates the blanket cylinder 2, and the magnitude is almost the same. That is, the urging force of the disc springs 30 and 54 on the rods 24 and 48 is adjusted by moving the adjustment nuts 31 and 55 of the vibration suppression means 7 and 8 forward and backward, and the pressing forces C and C of the rollers 20 and 44 on the bearer 4 are adjusted. By changing B, adjustment can be made in accordance with the force A that changes the direction and magnitude of the resultant force D.

As described above, by providing two vibration suppressing means, it is possible to accurately adjust an appropriate resultant force D with respect to the fluctuating force A. Further, by pressing both rollers 20 and 44 against the bearer 4 having the same diameter as the blanket cylinder 2 having a diameter larger than the end axis of the blanket cylinder 2, the blanket cylinder 2 is printed during printing.
Since the directions and the magnitudes of the pressing forces B and C from the rollers 20 and 44 acting on the roller are stabilized, the stable resultant force D can be easily adjusted.

In such a configuration, when printing is started, the plate cylinder 1, the blanket cylinder 2, and the impression cylinder 3 rotate in the direction of the arrow in FIG. 1, and when the notches of the plate cylinder 1 and the blanket cylinder 2 face each other, After the paper passes between the blanket cylinder 2 and the impression cylinder 3, the blanket cylinder 2 tends to move in the direction A in the figure with respect to the impression cylinder 3. At this time, the force A, which fluctuates on the line connecting the shaft center of the blanket cylinder 2 and the impression cylinder 3, by the pressing forces B, C of the rollers 20, 44 of the vibration suppression means 7, 8 is opposite in direction. Since the resultant force D having substantially the same magnitude acts on the blanket cylinder 2, the fluctuation of the blanket cylinder 2 in the direction A is suppressed. For this reason, the vibration of the blanket cylinder 2 due to the fluctuation is suppressed, so that it is possible to prevent a print streak from occurring on a printed material, and to prevent a decrease in print quality.

In this embodiment, the rollers are provided on the blanket cylinder, but it goes without saying that they may be provided on other cylinders. Although the rollers are pressed against the bearer, the rollers may be pressed against the end shaft of the trunk or a dedicated roller receiving portion may be provided. In addition, although the rollers are urged by the disc spring, various design changes can be made to the urging means, such as an air cylinder, a hydraulic cylinder, or a stroke screw type torque motor. Also, the disc spring 3
0, 54 and the vertical portions 11a, 47 of the brackets 11, 47
Although the sleeves 29 and 53 are interposed between the compression coil springs, the compression coil springs may be directly interposed without providing the sleeves 29 and 53.

FIGS. 4A and 4B show a main part of a second embodiment of the present invention. FIG. 4A is a side sectional view and FIG. 4B is a partial front view. The end shaft 2a of the blanket cylinder 2 is rotatably supported by the frame 5 via a bearing 60. Reference numeral 61 denotes a bearing which is rotatable about the end shaft 2a and whose movement in the axial direction is restricted. The bearing 61 slides at two places on the peripheral surface of the bearing 61 by a pair of support plates 64 erected from the frame 5. The flanges 62a of the pair of freely supported pressing rods 62 are in contact with each other. A compression coil spring 63 interposed between the flange portion 62a of the pressing rod 62 and the support plate 64 causes the blanket cylinder 2 to be attached to the end shaft 2a via a bearing 61.
The resultant force D acts in the opposite direction to the force A that fluctuates.

For this reason, the vibration of the blanket cylinder 2 due to the fluctuation is suppressed in the same manner as in the first embodiment described above, so that it is possible to prevent the occurrence of print streaks on the printed matter and to prevent the print quality from deteriorating. You. In the first embodiment, the roller 2
0, 44, the first and second vibration suppressing means 7,
8 is arranged so as not to contact the impression cylinder 3, but in the second embodiment, since the end shaft 2a is pressed by the pressing rod 62, the end cylinder 2a may be arranged so as to avoid the impression cylinder 3. Therefore, the degree of freedom in design is increased, the space can be effectively used, and the size can be reduced.

FIG. 5 is a partial front view showing a main part of a third embodiment of the present invention. In the third embodiment, the end shaft 2a of the blanket cylinder 2 projects outside the frame 5, a bearing 61 is provided on the projecting end 2b, and the projecting end 2b is pressed by a pressing rod 62 in the direction E in the figure. It was done. The third embodiment is effective when there is no space for providing a bearing 61 and the like between the frame 5 and the end surface of the blanket cylinder 2. The blanket cylinder 2 has a bearing 60 as a fulcrum and is opposite to the resultant force E. A force D in the direction, that is, a force in the direction opposite to the force A for fluctuating the blanket cylinder 2 acts.

[0026]

As described above, according to the present invention, there is provided a body rotatably supported, and a mating body rotatably supported in contact with the body, and a pressing member in contact with the body. By providing the pressing member with urging means for urging the body in a direction in which the body is separated from the partner body, it is possible to regulate fluctuations in the body when the notches face each other.
Vibration of the cylinder can be suppressed, so that a decrease in print quality can be prevented. Also, by adjusting the biasing force of the biasing means,
The load for suppressing the fluctuation of the body can be adjusted.

Further, according to the present invention, the plurality of rollers contacting the bearer of the trunk main body, and the direction of the resultant force in the direction of pressing and contacting each of the rollers against the bearer, is determined by the direction in which the trunk is moved relative to the mating trunk. Providing a plurality of biasing means for biasing in the direction of separation allows accurate adjustment of vibration suppression to be performed accurately. In addition, by pressing the roller against the bearer of the same diameter as the cylinder, the direction and magnitude of the pressing force from the roller acting on the cylinder during printing is stabilized, so it is easy to adjust the stable vibration suppression easily. Can be.

According to the present invention, since the pressing member is a bearing member rotatably supported on the end shaft of the body, the degree of freedom in design is increased, the space can be effectively used, and the size can be reduced. Can be

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of a rotary printing press according to the present invention.

FIG. 2 is an exploded plan view showing a support structure of one roller in FIG. 1;

FIG. 3 is a developed plan view showing a support structure of the other roller in FIG. 1;

FIGS. 4A and 4B show main parts of a rotary printing press according to a second embodiment of the present invention, wherein FIG. 4A is a side sectional view and FIG. 4B is a partial front view.

FIG. 5 is a partial front view showing a main part of a third embodiment of the rotary printing press according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Plate cylinder, 2 ... Rubber cylinder, 3 ... Impression cylinder, 4 ... Bearer, 7 ... 1st vibration suppression means, 8 ... 2nd vibration suppression means, 15, 4
0 ... lever, 20, 44 ... roller, 24, 48 ... rod,
30, 54: disc spring, 31, 55: adjusting nut, 61 ...
Bearing, 62: pressing rod, 63: compression coil spring.

Claims (3)

[Claims] 1. A rotary printing press comprising a rotatably supported cylinder and a counterpart cylinder rotatably supported by and contacting the cylinder, a pressing member contacting the cylinder, and a pressing member comprising: And a biasing means for biasing the cylinder in a direction away from the partner cylinder. 2. A rotary printing press comprising a rotatably supported cylinder having a bearer provided on a cylinder main body and a rotatably supported counterpart cylinder in contact with the cylinder. A plurality of rollers in contact with each other, and a plurality of urging means for urging the direction of the resultant force in the direction of pressing and pressing each of the rollers against the bearer so that the body is separated from the other body. A rotary printing press, characterized in that it is provided. 3. The rotary printing press according to claim 1, wherein the pressing member is a bearing member rotatably supported on an end shaft of the cylinder.