JPH0623972A - Cylinder cleaning device - Google Patents

Abstract

PURPOSE: To improve the economic effect of a cleaning device of a rubber blanket cylinder of a rotary offset printing press by increasing the speed of a cylinder to be cleaned and programming a control device so that the period of a cleaning process itself is decreased. CONSTITUTION: A control device 12 is provided beforehand to control all functions of a cleaning device 10, the rotation and stop conditions of a feed roll 8 and a storing roll 9, and a nozzle beam 11, wherein the control device is designed in the form of a microprocessor control which can be programmed. And in a cleaning step, the cleaning device is operated at full speeds, and to obtain approximately equal degree of cleaning at any speed, the control device is designed so as to decrease the period of the cleaning program at high speeds. By this method, the number of revolution of a rubber blanket cylinder 2 during the cleaning step can be made almost unchanged at any speeds. Thus, a cleaning work can be performed at high rotation speeds, and effective printing time can be optimized and material losses can be minimized so that the cylinder cleaning device can be improved so as to produce economic effects.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder, and more particularly, to a cleaning facility operable by a retracting facility and capable of being retracted into a rotating cylinder surface at sporadic intervals, and is selected for each cleaning step. The invention relates to a blanket cylinder of a rotary offset printing press, which is equipped with control equipment which enables the operation of the pull-in equipment one or more times per cleaning step by the action of a possible cleaning program.

[0002]

2. Description of the Prior Art In a rubber blanket cleaning apparatus of the method described in the well-known industrial field, the cleaning equipment has a pull-in equipment for the blanket cylinder to be cleaned, that is, the blanket cylinder to be cleaned. The time interval for each operation is included as a fixedly given time interval in advance.

[0003]

This means that the blanket to be cleaned rotates in contact with the cleaning equipment more frequently at higher cylinder speeds than at smaller cylinder speeds. The number of rotations of the cylinder for each withdrawal of the cleaning equipment is determined according to the printing speed based on aspects such as paper quality, edge folding method, and cutting method. Where previously unfavorable to ensure reliable cleaning,
That is, the cleaning time was cut off at a very slow speed. Also, it has been impossible until now to adapt the cleaning time interval at a fairly high speed. When cleaning during operation, non-printing occurred during the cleaning process. In a well-known configuration, the speed of printing was determined by the number of prints that could not be printed. Higher print speeds hit more prints than lower print speeds. Unprinted production not only means more material loss, but also more effective production time. It is therefore clear that the familiar arrangements are economically unsatisfactory.

An object of the present invention to solve this problem is to provide a cleaning equipment which can be operated by the drawing equipment and can be drawn into the surface of the rotating cylinder at sporadic intervals, and a cleaning equipment which can be selected for each cleaning process. Rotary offset printing machine equipped with a control device that enables the pulling-in operation of the pulling-in device at least once for each cleaning process by operating the cleaning program. To improve to.

[0005]

The object of the present invention is to enable the speed of the cylinder to be cleaned to be increased and to program the control equipment so that the duration of the cleaning process itself is reduced by the high speed rotation of the cylinder. Can be solved in a form having an inventive value.

[0006] These arrangements are a valuable method and allow optimization of effective production time and minimization of non-printing dropouts. Furthermore, in order to achieve a reliable cleaning guarantee for every case, there is a certain cylinder speed required for the cleaning process to be realized for every speed.

Useful placements and purposeful refinements of setup sequences are reported in the description below. There, the control equipment is purposely programmed to reduce the duration of each operation of the cleaning equipment within the cleaning process at higher cylinder speeds. These arrangements ensure that the amount of work in the cleaning process of the cleaning equipment can be the same at each speed, which allows an especially simple programming.

In order to ensure particularly optimum relationships, the programming of the control equipment is beneficially performed so that the cylinders to be cleaned achieve the same cylinder speed during the cleaning process and / or the operation of the cleaning equipment at their respective speeds. It is good to

Velocity input can be purposefully achieved by an encoder transmitting an angle signal. This allows an angle-wise adjustment of the additional cleaning equipment in an advantageous manner. This allows the control facility to be purposefully designed such that the cleaning facility can be pulled in and out at least partially as the recess passes. This arrangement can lead to a reduction in wear of the rubber blanket, especially in the area of the trailing edge with respect to the direction of rotation, especially in sheet-fed rotary presses with considerably large cylinder depressions. Even so, the spray equipment that supplies the cleaning liquid is blocked by the passage of the recess, which may prevent retention of the cleaning liquid in the recess, especially in spray equipment that sprays directly onto the cylinder to be cleaned. It is good to consider so that you can do it.

[0010]

The cleaning equipment capable of being drawn in at sporadic intervals serves to clean the cylinder surface after supplying the cleaning liquid to the rotating cylinder surface of the printing press. Allowing withdrawal at sporadic intervals means enabling adjustment of the cleaning action time intervals according to the cylinder speed. By receiving the rotation angle information of the cylinder, the control equipment has a function of avoiding only the recessed portion of the cylinder and pulling the cleaning equipment to the surface of the cylinder for a required time to perform the cleaning operation. The control equipment is equipped with a microprocessor to allow various cleaning programs to be installed, and the program can be selected, so that the cleaning equipment can operate once or many times during one cleaning process. It is configured so that it can be drawn into the cylinder surface. By adopting this method, the restriction on the cylinder speed from the cleaning work side could be lifted, so that the cylinder speed could be increased and the work efficiency was improved. The program is improved by shortening the time of one cleaning process when the cylinder speed is fast so that the cylinder rotation speed during the cleaning process time is almost constant, preferably always constant, regardless of the cylinder speed. The ability can be made to be able to keep the amount of unprinted generation constant at a low value. Making the cleaning equipment retractable while avoiding the cylinder dent allows the spray of the cleaning liquid to be supplied only to the surface other than the cylinder dent, and the cleaning cloth can be constantly fed to the cylinder surface. It means that it is possible to avoid particularly severe wear of the rubber blanket at the trailing edge portion with respect to the direction of rotation of the recess if left pressed. Adding an encoder to the tachometer that rotates together with the cylinder means that the tachometer can be used to accurately count digital information up to the rotation angle and transmit it to the control equipment. This allows for a minimum required cleaning operation at high speeds, minimizing imperfections during cleaning, optimizing effective printing time, and reducing material loss.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A sheet-fed rotary offset printing press is the base of the figure, which can be seen by a stand 1 and its one blanket cylinder (cylinder) 2. The blanket cylinder has a relatively large cylinder recess 3 in which a chuck device for the blanket blanket is arranged. A cleaning device 5 mounted on the control console 4 of the machine stand 1 is arranged for each blanket cylinder 2 for cleaning the rubber blankets, which cleaning device is at sporadic intervals, ie as required. It has cleaning equipment that can be drawn around the circumference of the cylinder. Activation of the cleaning equipment occurs during operation, i.e. while running a certain width of paper.

The cleaning equipment can be constituted by a rotating brush or the like that can be moored. In the described embodiment, the cleaning facility is a crimp beam 6
A cloth 7 in the form of, for example, a soft fluffy fabric is drawn on the beam. This cloth is supply roll 8
It reaches the storage roll 9 and is wound up on it. The crimping beam 6 can be retracted back and forth by a retracting element 10 here in the form of a cylinder-piston assembly which is arranged over the width of the machine. That is, it is possible to move from the waiting position shown by the one-dot chain line to the operating position shown by the dotted line, and vice versa. The forward movement prevents rotation of the storage roll 9 with respect to the used cloth, so that new cloth is unwound from the supply roll 8. The rearward movement drives the storage roll 9 and the supply roll 8 is prevented from rotating.

A nozzle beam 11 is preliminarily provided for the brim of the cloth 7, through which the cloth 7 overlying the crimping beam is supplied with the cleaning liquid over the entire width. The nozzle beam 11 is activated each time the cleaning equipment is dispatched for one cleaning operation. There may be one or multiple drying steps followed by one or multiple washing steps. This causes a dry cloth to be crimped around the circumference of the cylinder. The nozzle beam 11 is then placed in an idle state.

The control equipment 12 includes the cleaning device 5 and the support assembly 1.
0 and the supply roll 8 and the storage roll 9 are pre-equipped to control the rotating and stationary states of the roll 9 and the nozzle beam 11, but here it is designed in the form of a programmable microprocessor control. ing.
Various washing programs are installed therein, and each time the washing program is instructed by the selection switch 13 and can be manually selected as required. Different washing programs can be distinguished by the number of washing and drying steps that alternate during the washing process.

The alternating unwinding printing work cylinders are driven according to their respective operating methods, for example by the paper to be treated, the planned edge-folding method, etc., at mutually identical but variable speeds. The washing process is performed at full speed operation under the conditions. In order to obtain approximately the same degree of cleaning at each speed, the control equipment is designed to reduce the duration of the cleaning program itself at high speeds. With this method, the number of revolutions of the blanket cylinder 2 during the cleaning process will be almost or exactly the same at any speed. The control facility 12 of the above example should be such that the speed of the blanket cylinder 2 is always the same for each speed step of a multi-step cleaning program. Up to this point, the speed of the blanket cylinder 2 or an element that rotates in synchronization with this is grasped and given as the control amount of the control facility 12, but there is the use of a tachometer configuration for grasping the speed. In this case, the tachogenerator, which produces a speed analog signal, is a problem. In the above example, an incremental counting disk 14 which is rotatable with the blanket cylinder 2 is provided in advance, which is sensed by an associated sensor 15 located at the inlet of the front encoder 16 of the control facility 12. The sensor 15 emits a digital signal, which is converted by an encoder 16 into a suitable electrical signal for processing within the control facility 12.

In the web-fed rotary printing press, if an incremental counting disk having a structure for generating one signal for each cylinder revolution and detecting the number of revolutions is provided, a relatively small chuck groove is provided. Is enough in time. In the above example based on a sheet-fed rotary printing press with a printing work cylinder with a relatively large cylinder recess 3, the incremental counting disk 14 is not limited to producing only one signal per revolution, but many. Is designed to generate signals. Angle analysis is performed by this method. This makes it possible to determine the passing state of the cylinder recess 3 passing through the contact area between the cylinder circumference and the activated cleaning equipment to such an extent that it is impossible any more. Control equipment 12 to accommodate it
Pulls back the crimping beam 6 in the passing state of the cylinder recess 3 in the contact area and subsequently pushes it forward again again,
Alternatively, it is formed so that the pressing is released each time and then the pressing is restored again. This effectively prevents the rubber blanket at the trailing edge 17 in the direction of rotation of the blanket cylinder 2 in the recess 3 from being rapidly worn.

In the above example, the nozzle beam 11 is arranged behind the cloth 7, which carries the cleaning liquid onto the cylinder to be cleaned, ie the cylinder to be cleaned. Arranging in this way makes it possible to schedule the operation of the nozzle beam 11 regardless of the passing state of the depression. However, in the case of an arrangement in which the cleaning liquid is sprayed directly onto the cylinder to be cleaned, the control facility 12 ensures that the spray facility does not spray in the recessed state, and thus with the precision described above, which is not possible anymore. It may be a facility for angle analysis.

In many cases, it is appropriate to vary the wash program as a function of speed, eg, less drying steps and more washing steps for similar soils at higher speeds and lower speeds. It can be proved. When we consider the speed of the cylinder to be cleaned, we encounter this kind of change that is not possible anymore. In such a case, it is preferable that only the control equipment (12) is programmed to handle it.

[0019]

EFFECTS OF THE INVENTION Cleaning equipment capable of being drawn into the surface of a rotating cylinder at sporadic intervals, and a cylinder rotation speed during the cleaning process which avoids passing through the recessed portion of the cylinder when receiving a signal from a tachometer. By providing the control equipment that activates the cleaning equipment only until it reaches a certain number, it is possible to perform cleaning work at high speeds, and to optimize the effective printing time and minimize material loss. It was possible to improve the cylinder cleaning device so that it had a great economic effect.

[Brief description of drawings]

FIG. 1 is a schematic side view of a blanket cylinder cleaning device showing an embodiment of the present invention.

[Explanation of symbols]

 2 blanket cylinder 3 cylinder recess 5 cleaning device 6 crimping beam 7 cloth 10 drawing element 11 nozzle beam 12 control equipment 14 incremental counting disk 15 related sensor 16 encoder

Claims (8)

[Claims] 1. A cleaning facility (6, 7) and a control facility (1) capable of being drawn into the surface of a rotating cylinder at sporadic intervals.
2) and the cleaning equipment is a drawing-in equipment (10)
The control equipment can operate the cleaning equipment for each cleaning process more than once by the function of the selectable cleaning program, and the speed of the cylinder (2) to be cleaned can be increased. A cylinder of a rotary offset printing machine, in particular a blanket cylinder, characterized in that the speed can be increased and the control equipment (12) is programmed so that the duration of the cleaning process itself is reduced by high speed rotation of the cylinder. The cleaning device of (2). 2. A control facility (12) according to claim 1, wherein the control facility (12) is programmed to reduce each of the durations of a single in-process operation of the cleaning facility (6, 7) at high cylinder speeds. A device for cleaning a cylinder, especially a blanket cylinder (2). 3. The control equipment (12) according to any one of the preceding claims, rotating at a respective cylinder speed during at least one of a cleaning process and an operation of the cleaning equipment (6, 7). A device for cleaning a cylinder, in particular a blanket cylinder (2), characterized in that the number of revolutions of the cylinder to be cleaned (2) to be cleaned is programmable so as to be almost the same, preferably exactly the same. 4. In any one of the preceding claims, the control facility (12) is designed such that the cleaning program can be at least partly changed according to the speed of the cylinder to be cleaned (2). Cleaning device for the characteristic cylinders, especially the blanket cylinder (2). 5. The control device (12) according to any one of the preceding claims, in particular a sheet-fed rotary printing press, wherein the cleaning device (6, 7) is at least partly disengaged as the recess passes. Cleaning device for a cylinder, in particular a blanket cylinder (2), characterized in that it is designed such that it can be retracted, preferably released and pressed. 6. The sheet machine type rotary printing machine according to claim 1, wherein the control facility (12) is provided with a cylinder recess for the spray facility, in particular for a sheet-fed rotary printing press provided with a cylinder to be purified. A cleaning device for a cylinder, in particular a blanket cylinder (2), characterized by being activated by passage of (3). 7. In any one of the preceding claims, at least one of the cylinder to be cleaned (2) and an element that can be driven in synchronization with the cylinder is preferably provided with an encoder (16) to make one cylinder revolution. A tachometer emitting at least one signal for each, which is followed by a control facility (12) which is preferably provided for microprocessor control. Cleaning device for cylinders, especially blanket cylinders (2). 8. Cleaning device according to claim 7, characterized in that it is equipped beforehand with a tachometer (14, 15) for transmitting an angle signal, in particular for a blanket cylinder (2).