JPH0315305Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a plate cylinder changing device in a printing unit of a gravure printing press.

PRIOR ART As a plate cylinder of a gravure printing machine, a shaftless plate cylinder having holes for inserting a chuck cone at both ends is often used. It is held by King Corn. Replacing the plate cylinder usually depends on the operator manually lifting the plate cylinder, which is a difficult and dangerous task. As a method for eliminating such manual work, a method is known in which a plate cylinder transporting cart equipped with a manual lifting device is used. The procedure for replacing plate cylinders using a plate cylinder transport cart is to first remove the ink pan and related piping below the plate cylinder of the printing unit, carry an empty plate cylinder transport cart into that position, and replace the plate cylinder on the printing unit. The cylinder support part is raised to the position of the plate cylinder by the lifting device, the plate cylinder is supported by the plate cylinder support part, the plate cylinder is lowered, the cart is moved outside the unit, and then the cart with the new plate cylinder is placed. The plate cylinder is carried into the unit, lifted to the plate cylinder mounting position by a lifting device, and the plate cylinder is mounted by visually determining its position in the vertical and longitudinal directions.

Problems that the invention aims to solve However, with this method, it is necessary to carry the plate cylinder transport cart with a lifting device into the printing unit when installing and removing the plate cylinder, and therefore, the ink pan and ink supply piping, etc. must be removed. Preparation is time-consuming, resulting in a decrease in production efficiency.

The present invention aims to solve these conventional problems, and aims to provide a plate cylinder changing device that allows plate cylinders to be replaced without removing the ink pan, ink supply piping, etc. from the printing unit. do.

Means for Solving the Problems That is, the plate cylinder changing device of the present invention is provided in a printing unit of a gravure printing machine so as to be rotatable about an axis parallel to the central axis of the plate cylinder 1 attached to the unit. a rotating arm 12 that is rotatably held by the rotating arm, a plate cylinder support 13 that supports the peripheral surface of the plate cylinder, and a plate cylinder support 13 that maintains the plate cylinder support 13 horizontally regardless of the rotation of the rotating arm. It is characterized by having a horizontal maintenance mechanism (pulleys 17, 18 and belt 19 in the embodiment).

Operation According to the plate cylinder changing device described above, after printing is completed, the ink pan 4 below the plate cylinder is lowered, and the rotating arm 12
to position the plate cylinder support 13 under the plate cylinder 1, release the chuck of the plate cylinder and place the plate cylinder 1 on the plate cylinder support 13, then rotate the swing arm 12, The plate cylinder can be removed by transporting the plate cylinder out of the printing unit and placing the plate cylinder 1 placed on the plate cylinder support 13 on a suitable plate cylinder transport device such as a trolley 21 or a crane, and vice versa. The plate cylinder can be attached by performing the following steps. During this operation, the plate cylinder support 13 supports the plate cylinder 1 by simply placing the peripheral surface of the plate cylinder 1 on it, but it always maintains a horizontal position regardless of the rotation of the rotating arm. Therefore, the plate cylinder can always be stably supported. Note that the present invention may be applied not only to replacing a plate cylinder without a shaft, but also to replacing a plate cylinder with a shaft.

Embodiments Hereinafter, preferred embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a side sectional view of the main part of a printing unit of a gravure printing press equipped with a plate cylinder changing device of the present invention. In the figure, 1 is a plate cylinder, 2 is a chuck cone that holds the plate cylinder, 3 is a finesse roller, 4 is an ink pan, 5 is a lifting platform that supports the ink pan 4 and moves up and down, and 6 is a unit frame. . The fine print roller 3 is held by an ink pan 4 and moves up and down together with the ink pan 4. 1
Reference numeral 0 designates a plate cylinder changing device according to the present invention, which is arranged at a position that does not interfere with the raising and lowering of the ink pan 3.

As shown in FIG. 2, the plate cylinder changing device 10 has a unit frame arranged parallel to the center axis of the tracking cone 2, and thus parallel to the center axis of the plate cylinder held by the tracking cone 2. a drive shaft 11 rotatably held at 6;
A pair of rotating arms 12, 12 fixed to 1, a plate cylinder support 13 rotatably held at the tip thereof,
It has a magnitude of 13. The drive shaft 11 is adapted to be rotationally driven by a rotary drive device (not shown), and swings the supported swing arm 12. The plate cylinder support 13 has a substantially V-shape so as to be able to support the peripheral surfaces of plate cylinders of various diameters. In addition,
Instead of directly holding the circumferential surface of the plate cylinder with the V-shaped inner surface (upper surface), as shown in FIG.
3 may be provided with a freely rotating ball 14, or a rotatable roller 15 may be provided as shown in FIG. Providing such balls 14 and rollers 15 has the advantage that the plate cylinder 1 can be rotated easily, and when the chuck cone 2 is inserted into the plate cylinder 1, the phase of both can be easily aligned.

The plate cylinder support 13 has a shaft 16 fixed thereto, which shaft 16 is rotatably held on the pivot arm 12. A pulley 17 is fixed to the tip of this shaft 16, and is connected by a belt 19 to a pulley 18 rotatably held by the drive shaft 11. The pulley 18 is fixed to the unit frame 6 by suitable means and does not rotate at all times regardless of the rotation of the drive shaft 11. Therefore, even if the swing arm 12 swings due to the rotation of the drive shaft 11, the plate cylinder support 13 at its tip does not rotate and remains in a constant direction, that is, in a horizontal state with the surface holding the plate cylinder facing upward. The plate cylinder 1 can be held well at all times. These pulleys 17, 18 and belt 19 constitute a leveling mechanism that maintains the plate cylinder support horizontally regardless of the rotation of the swing arm.
Note that the leveling mechanism is not limited to the one using the illustrated pulleys and belts, but may use other means, such as one using links.

In the vicinity of the printing unit, a rail 22 for running the plate cylinder transport cart 21 is provided.
A stopper (not shown) is provided for positioning 1 in a predetermined position. The transport cart 21 has a plate cylinder support stand 23 that supports approximately the center of the plate cylinder, and the length of this support stand 23 is equal to the length of the pair of plate cylinder supports 1.
The interval is set to be smaller than the interval of 3. The mounting position of the drive shaft 11 of the plate cylinder changing device 10 is such that the plate cylinder supported on the plate cylinder support 13 comes to the plate cylinder chucking position and the plate cylinder support stand 23 position of the plate cylinder transport cart by the rotation of the swing arm 12. It is determined that

Next, the plate cylinder exchanging operation by the above-mentioned plate cylinder exchanging device 10 will be explained. During normal printing, the plate cylinder changing device 10 is on standby in the state shown in FIG. After printing is completed, the ink pan 4 and finesse roller 3 are lowered to allow the plate cylinder to be removed. Next, as shown in FIG. 5A, the swing arm 12 is rotated to position the plate cylinder support 13 at the tip below the plate cylinder 1, and in this state, the chuck of the plate cylinder is removed to move the plate cylinder to the plate cylinder support. I will post it on 13. Next, the rotating arm 12 is rotated as shown in FIG. 5B to carry it out of the printing unit and to a position higher than the plate cylinder support base 23 of the transport carriage 21. Next, as shown in FIG. 5C, the plate cylinder 1 is transferred to the carrier 21 by positioning the plate cylinder carrier 21 below the plate cylinder and pivoting the swing arm 12 downward. This completes the work of removing the used plate cylinder. Next, in order to install a new plate cylinder, first, as shown in FIG. scoop up. Next, transport trolley 2
1 from below the scooped-up plate cylinder, rotate the rotating arm 12 as shown in FIG. 5E,
The plate cylinder 1 held at the tip is brought to a chucking position (a position held by a chucking cone 2) and stopped at that position. Thereafter, the chucking cone 2 is moved forward and its tip is inserted into a hole in the side of the plate cylinder 1 to hold the plate cylinder 1. At this time, if it is necessary to align the phases of the plate cylinder 1 and the chuck cone 2, move the plate cylinder 1 to the plate cylinder support
3 or by rotating the tracking cone 2. After the plate cylinder 1 is held by the chucking cone 2, the rotating arm 1
2 is returned to the position shown in FIG. 5F, and the plate cylinder mounting operation is completed.

In the above operations, the raising and lowering of the ink pan, the turning and stopping of the swing arm, the forward and backward movements of the chucking cone, etc. may be performed in whole or in part by push button operations by the operator, or all or all of the movements may be performed by push buttons by the operator. may be performed automatically by sequence control or the like. By the way, the plate cylinder support 1
The plate cylinder 1 held at the plate cylinder 3 has various diameters, and therefore, the stopping position of the plate cylinder support 13 when positioning the plate cylinder 1 in the chucking position changes depending on the diameter of the plate cylinder. Therefore, when the rotating arm 12 and the rotating arm 12 are to be stopped automatically, it is necessary to correct the stopping angle position according to the diameter of the plate cylinder. In FIG. 6, when the center of the plate cylinder placed on the plate cylinder support 13 is aligned with the center A of the chucking cone, the turning arm stopping angle θ with respect to the plate cylinder diameter can be calculated as follows. .

L ₂ =l ₀ +r/sinα−l ₁ cosθ cosθ=l ₀ +r/sinα−L ₂ l ₁ ∴θ=cos ^-1 [l ₀ +r/s
inα−L ₂ /l ₁ ] If the swing arm 12 is stopped at the angle θ determined by the above calculation, the center of the plate cylinder placed on the plate cylinder support 13 will be aligned with the center of the chuck cone 2. can be made to match the same height. Since the plate cylinder support 13 moves in an arc, even if the center of the plate cylinder 1 is at the same height as the center of the chuck cone 2, a horizontal shift occurs depending on the diameter of the plate cylinder. However, this deviation causes the center of rotation of the swing arm 12 to be at an appropriate position relative to the center of the chuck cone 2, that is, the plate cylinder of average diameter is placed in the plate cylinder support 1.
3 so that the pivot arm becomes almost horizontal when its center is aligned with the center of the chucking cone, it becomes extremely small and there is no problem. The optimum rotational center position of the swing arm 12 is at a height of L ₂ =l ₀ +r max +r min/2sinα/2 and as far away from the center of the chucking cone as possible.

For example, when the arm length l ₁ =300 mm and the plate cylinder diameters r _nax =143 mm and r _nio =80 mm, the maximum horizontal deviation amount is about ±1.5 mm. On the other hand, the tip of the chucking cone is tapered and there is no problem with a deviation of about ±3 mm, so chucking is possible.

As described above, in order to stop the swing arm 12 when the center of the plate cylinder held by the plate cylinder support 13 is at the same height as the center of the chucking cone, the swing arm is stopped at the above angle θ. Just let it happen. In order to automatically perform this operation, a microprocessor is installed to calculate the angle θ, and an encoder for detecting the rotational position is installed on the drive shaft, so that the operator can input the plate cylinder diameter in advance, and Calculate the stopping angle θ of the swing arm relative to the diameter,
The drive shaft may be configured to be stopped by an encoder signal from the swing arm drive shaft. When positioning the plate cylinder support 13 under the chucked plate cylinder 1, the plate cylinder 1 is detected by a sensor such as a proximity switch provided on the plate cylinder support 13, and the signal is used to automatically detect the plate cylinder 1. It may be stopped temporarily.

FIG. 7 shows another embodiment of the present invention. In this embodiment, the plate cylinder support 13 is connected to two parallel rotating arms 3.
It is held at 2. The two pivot arms 32 also act as a horizontal maintenance mechanism for the plate cylinder support 13. Further, in FIG. 7, a plate cylinder transporting carriage 33 has a plate cylinder support stand 34 which can carry two plate cylinders and is rotatable. This cart is convenient because the plate cylinders can be replaced by just one round trip from the plate cylinder storage area to the printing unit.

Effects of the Invention As described above, according to the plate cylinder changing device of the present invention, the ink pan is simply lowered and the rotating arm 12
The plate cylinder can be replaced simply by creating a space for the plate cylinder to hold and rotate, which shortens printing preparation time and improves production efficiency.
In addition, manual labor and heavy labor by the operator can be reduced, which can be highly effective in simplifying operations.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the main parts of a printing unit equipped with the plate cylinder changing device of the present invention, Fig. 2 is a perspective view of the plate cylinder changing device, and Figs. 3 and 4 respectively show the plate cylinder support. A perspective view showing a modified example, FIGS. 5A to 5F are diagrams for explaining the plate cylinder exchanging operation by the plate cylinder changing device, and FIG. 6 shows the positional relationship between the plate cylinder held by the rotating arm and the chucking cone. FIG. 7 is a perspective view of another embodiment. DESCRIPTION OF SYMBOLS 1... Plate cylinder, 2... Chucking cone, 3... Punisher roller, 4... Ink pan, 6... Unit frame, 10... Plate cylinder exchange device, 11... Drive shaft, 12... Swivel arm, 13... Plate cylinder supporter ,
17, 18... Pulley, 19... Belt, 21... Plate cylinder transport cart.

Claims (1)

[Claims for Utility Model Registration] (1) In a printing unit of a gravure printing press, a rotating arm provided to be able to rotate about an axis parallel to the central axis of a plate cylinder attached to the unit, and the rotating arm. A plate comprising: a plate cylinder support that is rotatably held by the plate cylinder and supports the circumferential surface of the plate cylinder; and a horizontal maintenance mechanism that maintains the plate cylinder support horizontally regardless of rotation of the swing arm. Torso exchange device. (2) The plate cylinder changing device according to claim 1, wherein the plate cylinder support has a rotatable ball or roller that supports the plate cylinder.