JP4475745B2 - Gravure printing unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing unit of a gravure printing machine, and more particularly to a gravure printing unit provided with a loading device for easily performing plate cylinder replacement.
[0002]
[Prior art]
As a plate cylinder of a gravure printing machine, a shaftless plate cylinder having holes for inserting chucking cones at both ends of a plate cylinder chucking shaft at both ends is often used. The shaftless plate cylinder is held by chucking shafts provided on the side frames on both sides of the printing unit when in use. In order to change the plate cylinder held on the plate cylinder chucking shaft, the carriage for carrying the plate cylinder is usually positioned in front of the printing unit, and the plate cylinder is placed between the carriage and the plate cylinder chucking shaft. It is changed manually. When it is necessary to clean the ink pan, a hand carriage for transporting the ink pan cover or the ink pan cover placed on the ink pan is positioned in front of the printing unit, and the ink pan body or the ink pan cover is manually operated between the hand carriage. We are exchanging. Further, instead of using a dedicated hand carriage for transporting the plate cylinder and the ink pan body or the ink pan cover, a hand carriage capable of mounting the plate cylinder and the ink pan or ink pan cover may be used. Replacing the plate cylinder, ink pan, and the like was performed sequentially for each printing unit for a plurality of printing units provided in the printing machine after the printing machine was stopped.
[0003]
[Problems to be solved by the invention]
However, these conventional methods have a problem that a heavy plate cylinder and an ink pan have to be manually replaced, which imposes heavy labor on the worker, and also requires a large amount of work and a heavy work load. . In addition, since it takes time to replace the plate cylinder, the ink pan, etc., there is also a problem that the stop time (setup time) of the printing press becomes long and the operation rate is lowered.
[0004]
Therefore, in order to easily perform plate cylinder replacement, there is known one in which each printing unit is provided with a plate cylinder changing device for transporting the plate cylinder between the plate cylinder chucking shaft and the carriage (for example, actual fairness). 3-15305 gazette). However, even when this plate cylinder changer is used, it is necessary to sequentially work on a plurality of printing units because the carriage is manually put in and out, and the stop time of the printing press is also prolonged. There was a problem. In addition, even if the plate cylinder can be replaced, the replacement of the ink pan body or the ink pan cover still relies on manual work, the work has not been simplified, and the printing machine downtime required for the work The problem of taking a long time has not been resolved.
[0005]
The present invention has been made in view of such problems, and mechanizes the plate cylinder and ink pan replacement work in the gravure printing unit, reduces the work load on the operator and shortens the stop time of the printing press to increase the operating rate. An object is to provide a gravure printing unit that can be enhanced.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides two loading apparatuses for replacing the plate cylinder so as to be located on both sides of the axis of the plate cylinder chucking shaft provided in the printing unit. It is characterized in that the plate cylinder support part is also used as an ink pan. With this configuration, during normal operation, the ink pan of one loading device is positioned at the inking position below the plate cylinder during operation, and normal printing is performed, and the other loading device is provided during the operation. Install the ink pan cover on the existing ink pan, clean the ink pan, or place a new printing cylinder on the ink pan for the next use, and stop the press to set up for the next printing operation Then, the loading device on the ink pan side used was operated, the plate cylinder used in the ink pan was received, then the ink pan was moved to the retracted position, and then the other loading device was operated, The new plate cylinder held on the ink pan is moved to a predetermined position on the printing unit and held on the plate cylinder chucking shaft. , Followed by stopping moves the ink pan to a predetermined inking position, it is possible to perform the replacement of the plate cylinder and the ink pan. Thus, the operation time can be increased by shortening the stop time of the printing press required for replacing the plate cylinder and the ink pan.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
As described above, the printing unit of the present invention is provided with two sets of loading apparatuses for replacing the printing cylinder so as to be located on both sides of the axis of the printing cylinder chucking shaft of the printing unit, and the printing cylinder provided in each loading apparatus. The support portion also serves as an ink pan. The loading device used here is a plate exchange arm provided so as to be pivotable about an axis parallel to the axis of the plate cylinder chucking shaft, an ink pan held at the tip of the plate exchange arm, and an ink pan provided therein. A plate cylinder support portion composed of a plate cylinder support member, a posture maintaining mechanism that always maintains the orientation of the plate cylinder support portion upward regardless of the rotation of the plate exchange arm, and the plate exchange arm. Arm rotation that pivots to move to a plate cylinder replacement position for attaching and detaching the plate cylinder with the plate cylinder chucking shaft, an inking position for printing, and a retracted position that does not interfere with the printing operation. A configuration including a mechanism is preferable. With this configuration, the ink pan and the plate cylinder held on the ink pan can be moved to the plate cylinder replacement position, the inking position, and the retracted position while maintaining the upward state simply by turning the plate replacement arm. A desired operation can be performed with the configuration.
[0008]
【Example】
Embodiments of the present invention shown in the drawings will be described below. FIG. 1 is a schematic cross-sectional view showing a printing unit of a gravure printing machine according to a preferred embodiment of the present invention, cut at substantially the center of an ink pan, and FIG. 2 is a plate exchange arm holding the printing unit at one end of the ink pan. It is a schematic sectional drawing cut | disconnected and shown just outside. 1 and 2, 1 is a printing unit, 2 is a side frame, 3 is a plate cylinder chucking shaft attached to the side frame 2, 4 is a plate cylinder held on the plate cylinder chucking shaft 3, and 5 is A web, 6 is an impression cylinder that presses the web 5 against the plate cylinder 4, 7 is a finisher roller, and 8 is a doctor. Each of these members is the same as the conventional device.
[0009]
Reference numerals 11 </ b> A and 11 </ b> B denote plate cylinder replacement loading devices respectively disposed on both sides of the axis O of the plate cylinder chucking shaft 3. The loading devices 11A and 11B are respectively held at the tip of the plate changing arm 12 and the plate changing arm 12 provided so as to be pivotable about axes P and Q parallel to the axis O of the plate cylinder chucking shaft 3. A plate cylinder support portion 13 composed of an ink pan 14 and a plate cylinder support member 15 provided therein, and the orientation of the plate cylinder support portion 13 is always maintained upward as shown in the figure regardless of the rotation of the plate exchange arm 12. An attitude maintaining mechanism 17 and an arm turning mechanism (not shown) for turning the plate exchange arm 12 as described later are provided. Here, as shown in FIG. 7, the plate cylinder support member 15 provided in the ink pan 14 is a block-like member placed on the bottom surface of the ink pan 14 at intervals in the longitudinal direction. A V-shaped support surface 15a is provided, and a plate cylinder can be placed thereon. In FIG. 2, the posture maintaining mechanism 17 is fixed to the side frame 2, a shaft 20 that rotatably holds one end of the plate exchange arm 12, and a pulley 21 that is fixed to the shaft 20, A shaft 23 rotatably held at the tip of the plate changing arm 12, a support base 24 fixed to the shaft 23 and supporting the ink pan 14, a pulley 25 fixed to the shaft 23, and the pulleys 21 and 25 are hung. Belt 26 is provided. With this configuration, even when the plate exchange arm 12 turns to an arbitrary position, the shaft 20, the pulley 21, the pulley 25, and the shaft 23 do not rotate (however, the plate exchange arm 12 rotates). The support base 24 fixed to the shaft 23 also does not rotate. Therefore, the plate cylinder support portion 13 including the ink pan 14 and the plate cylinder support member 15 always maintains the upward state shown in the drawing. The posture maintaining mechanism 17 is not limited to this configuration, and can be changed as appropriate.
[0010]
The plate exchange arms 12 of the loading devices 11A and 11B provided on both sides of the plate cylinder chucking shaft 3 are used for attaching and detaching the plate cylinder to and from the plate cylinder chucking shaft 3 respectively. Plate cylinder replacement position (the position shown in FIG. 3 for the loading device 11A, the position shown in FIG. 5 for the loading device 11B), and the inking position for printing (the position shown in FIG. 1 for the loading device 11A, the loading device) 11B) and a retreat position (position where the ink pan 14 is below the shaft 20) that does not interfere with the printing operation, and the plate exchange arm is provided. The arm turning mechanism for turning is configured such that the plate exchange arm 12 can be turned to a desired position and stopped. . Since the plate cylinder replacement position of the ink pan 14 varies depending on the diameter of the plate cylinder 4, by inputting the plate cylinder diameter to the arm turning mechanism, the plate exchange arm 12 corresponding to the diameter is given by calculation processing. A control device for determining the position is provided.
[0011]
Next, the plate cylinder and ink pan replacement operation of the printing unit having the above configuration will be described. At the time of normal printing, as shown in FIG. 1, the ink pan 14 of one loading device 11A is an inking position located below the plate cylinder 4 held by the plate cylinder chucking shaft 3, and the ink pan 14 14 is used to perform a printing operation. At this time, the ink pan 14 is attached with an ink pan cover (usually made of a plastic film) 30 for preventing ink stains of the ink pan 14 and the plate cylinder support member 15. During this printing operation, the ink pan 14 of the other loading device 11B is in a position that does not interfere with the printing operation. Therefore, an ink pan cover 30 is attached to the ink pan 14 and the plate cylinder 4A to be used next in the ink pan 14 (FIG. 3). (See). The new plate cylinder 4A is loaded onto the ink pan 14 manually or by a plate cylinder loading / unloading device (not shown), and the ink pan cover is replaced manually. These operations are mainly performed manually, but can be performed sequentially for each printing unit during the printing operation, so there is no need to stop the printing press.
[0012]
When the predetermined printing is finished and the plate cylinder and the ink pan need to be replaced, the printing machine is stopped. Next, the end of the ink pan cover 30 (see FIG. 1) of the ink pan 14 used by the operator is folded back onto the plate cylinder support member 15, and the back of the cover that is not soiled with ink faces upward. The trunk support member 15 is covered. This operation is sequentially performed for a plurality of printing units provided in the printing press. Then, after completing this preparatory work, the following replacement operation is automatically performed for all the printing units simultaneously. That is, first, the operation of the loading device 11A on the side provided with the ink pan 14 that has been used is started, and the plate exchange arm 12 pivots upward to receive the ink pan 14 and the plate cylinder 4 as shown in FIG. Then, the plate cylinder chucking shaft 3 is moved backward to release the holding of the plate cylinder 4. As a result, the used plate cylinder 4 is placed on the plate cylinder support member 15 in the ink pan 14. Next, as shown in FIG. 4, the plate exchange arm 12 of the loading device 11 </ b> A pivots downward to move the ink pan 14 and the plate cylinder 4 held thereon to a lower retreat position. Next, the other loading device 11B starts to operate, and as shown in FIG. 5, the ink pan 14 holding the new plate cylinder 4A is raised to the plate cylinder replacement position and stopped at that position. Next, the plate cylinder chucking shaft 3 moves forward to hold the new plate cylinder 4A. Thereafter, the plate exchange arm 12 pivots downward, and the ink pan 14 is positioned at the inking position and stopped as shown in FIG. Thus, the plate cylinder and ink pan replacement operation is completed. Thereafter, after the other setup work of the printing press is completed, the operation of the printing press is resumed. Then, during the printing operation, the plate cylinder is taken out from the ink pan 14 of the loading device 11A previously moved to the retracted position, the ink pan cover is replaced with a new one, and a new plate cylinder is placed thereon. Thus, the next replacement preparation is completed.
[0013]
As described above, since the two types of loading devices 11A and 11B are provided, the work performed while the printing press is stopped can be performed by placing the end of the ink pan cover 30 of the used ink pan 14 on the plate cylinder support member 15. Other than performing the folding work manually, it can be performed automatically, so that the work load on the operator is extremely reduced, and the plate cylinder and the ink pan can be replaced by the loading apparatuses 11A and 11B automatically and in a plurality. Since the printing units can be performed simultaneously, the stop time of the printing press can be greatly shortened. For this reason, the operating rate of a printing machine can be improved significantly.
[0014]
In the above embodiment, an ink pan cover is attached to each ink pan. However, the present invention is not limited to this configuration, and the ink pan may be directly cleaned without using the ink pan cover. In this case, after the used ink pan is moved to the retracted position, the ink pan is removed from the loading device during the printing operation and transported to the cleaning place, where it is cleaned, and then returned to the original loading device. What is necessary is just to make it wait for the next switching.
[0015]
【The invention's effect】
As described above, the present invention is provided with a printing unit provided with two types of plate cylinders and a loading device for ink pan replacement, and the plate cylinder support provided in each loading device also serves as an ink pan. During the printing operation using the ink pan of one loading device, the plate cylinder and the ink pan for the next use are prepared in the other loading device, and when the printing machine is stopped, all the operations are performed automatically. Simultaneously with the printing unit, the two loading devices can be operated in sequence to change the plate cylinder and ink pan, greatly reducing the printing machine stop time required to change the plate cylinder and ink pan, and operating the printing machine. It has the effect that the rate can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a printing unit of a gravure printing machine according to a preferred embodiment of the present invention, cut at substantially the center of an ink pan. FIG. 2 holds the printing unit shown in FIG. FIG. 3 is a schematic sectional view showing the printing unit shown in FIG. 2 cut off just outside the plate changing arm. FIG. 4 is a schematic sectional view showing the printing unit shown in FIG. Fig. 5 is a schematic cross-sectional view showing the printing unit shown in Fig. 3 in a state where the ink pan that has received the plate cylinder 4 is moved to the retracted position. Fig. 5 shows the printing unit shown in Fig. 4 with the plate cylinder exchange of the ink pan of the other loading device 11B. FIG. 6 is a schematic sectional view showing the printing unit shown in FIG. 5 with the ink pan of the loading device 11B moved to the inking position. 7] ink pan and schematic perspective view of a plate cylinder support members provided therewith [Description of symbols]
DESCRIPTION OF SYMBOLS 1 Printing unit 2 Side frame 3 Plate cylinder chucking axis | shaft 4 Plate cylinder 4A New plate cylinder 5 Web 6 Impression cylinder 7 Finisher roller 8 Doctor 11A, 11B Loading apparatus 12 Plate exchange arm 13 Plate cylinder support part 14 Ink pan 15 Plate cylinder support member 17 Posture maintenance mechanism 20, 23 Shaft 21, 25 Pulley 24 Support base 26 Belt

Claims (2)

In a gravure printing machine using an axisless plate cylinder, two loading apparatuses for replacing the plate cylinder are provided so as to be located on both sides of the axis of the plate cylinder chucking shaft provided in the printing unit. A gravure printing unit characterized in that the plate cylinder support portion provided also serves as an ink pan. Each of the loading devices is provided with a plate changing arm provided so as to be pivotable about an axis parallel to the axis of the plate cylinder chucking shaft, an ink pan held at a tip of the plate changing arm, and an inside thereof. A plate cylinder support portion constituted by a plate cylinder support member, a posture maintaining mechanism for always maintaining the direction of the plate cylinder support portion, that is, the direction of the plate cylinder, upward regardless of the rotation of the plate exchange arm, and the plate exchange arm Is rotated so as to move to a plate cylinder replacement position for attaching / detaching the plate cylinder to / from the plate cylinder chucking shaft, an inking position for printing, and a retracted position that does not interfere with the printing operation. The gravure printing unit according to claim 1, further comprising an arm turning mechanism.

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