JPH0441241A - Cylinder washing device of printer - Google Patents

Abstract

PURPOSE:To avoid interference of a washing device with a notch part by evacuating the washing device certainly from the notch part by a method wherein a notch part angle position of each cylinder is calculated by estimation based on an angle data and a timing pulse, and an actuation command is outputted to each washing device. CONSTITUTION:Various angle data of a printer are inputted from a console panel 80. When printing is started, a timing signal to be outputted from a timing sensor 90 is fetched at a specific rotary angle position of a rotary shaft 31 of a first colour printing unit 30. A controller 70 prepares an angle timing map of an impression cylinder 2 in each printing unit 30 by the timing signal and the angle data and further prepares a washing program. When washing is started, the washing program performs washing operation in synchronization with the timing map of each printing unit 30. A signal from the controller 70 controls air becoming a power source of each washing unit 40 and evacuates the washing unit 40 from a notch part 4 of each impression cylinder 2 obtained by estimating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylinder cleaning device for a printing press, and in particular, it simplifies the means for detecting notches in each cylinder of a multicolor printing press. The present invention relates to means for reliably operating the cleaning unit while avoiding interference between the cleaning unit corresponding to the above-mentioned notch and the notch.

[Prior Art] There are various types of cylinder cleaning devices, such as one in which a cleaning cloth soaked with cleaning liquid is pressed against the cylinder, and one in which a rotating brush containing a solvent is pressed against the cylinder without using a cleaning cloth. be. In any type of cleaning device, in order to avoid interference between the cleaning unit and the notch of the cylinder to be cleaned, it is necessary to retreat the cleaning unit from the notch of the cylinder.

Here, a cleaning unit in which a cleaning cloth soaked in cleaning liquid is pressed into contact with a cylinder will be described, but the present invention
The present invention can be applied to other types of cleaning devices as long as it is a printing press in which it is necessary to avoid interference between the cleaning unit and the notch of the cylinder to be cleaned.

Now, as one of the conventional cylinder cleaning units, an example of the configuration of an impression cylinder cleaning unit is shown in FIGS. 3 and 4 together with the impression cylinder to be cleaned.

In these figures, 2 is an impression cylinder to be cleaned, 4 is a notch that accommodates a paper presser claw 6 (not shown) that grips the edge of a sheet, 8A and 8B are side plates, 10 is a cloth supply roll, 12 is a cloth take-up roll; 14 is a cloth supply roll 10
A cleaning cloth 1 that is unwound from a cloth and wound around a cloth take-up roll 12.
Reference numeral 6 denotes a support par 18 fixed to the side plates 8A and 8B. A cleaning liquid spray bar 120 sprays cleaning liquid onto the cleaning cloth prior to cleaning. A pressure pad 6 presses the cleaning cloth 14 against the impression cylinder 2 during cleaning.

The cleaning cloth winding roll 12 is 1, for example, Japanese Patent Publication No. 56-3706.
As described in Japanese Patent No. 9, it is driven intermittently or continuously at a predetermined speed by a driving device. In a sheet-fed printing press like this example, the cleaning cloth is wound up at a position facing the impression cylinder notch 4, and the pressure pad 20 is turned toward the impression cylinder 2 at a position other than the notch 4. By extruding
The cleaning cloth 14 located on the outer peripheral surface of the pressure pad 20 is pressed to a pressure g42 to clean it.

[Problems to be Solved by the Invention] In the notch 4 of the impression cylinder 2, there is a paper presser claw 6 (not shown) that grips a sheet of paper, and when the cleaning unit hits this, the cleaning cloth 14 is caught and the excess paper is removed. Not only will the cleaning cloth 14 not be pulled out properly, but the cleaning cloth 14 will also become entangled in the printer body, causing trouble.

An outline of conventional means for solving this cause is shown in FIGS. 5 and 6.

In the system shown in FIG. 5, a cam is formed at the end of the impression cylinder corresponding to the notch 4, and the cleaning unit is forcibly lifted while the notch 4 passes.

In the method shown in Fig. 6, a sensor is installed to detect the notch 4 optically or electromagnetically, and the cleaning unit is forcibly evacuated by an air cylinder or the like (not shown) while the notch 4 passes. It has become.

In these systems, in the case of multicolor printing, the notches of the impression cylinders of the printing units 30 of each color are generally shifted as shown in FIG. had to be installed separately.

Also, even when adjusting the timing of relief of the notch,
Mechanically moving the detection mechanism for each printing unit,
I had to make some adjustments.

Furthermore, even after adjustment, if a part of the printing unit is replaced, mechanical readjustment is required.

An object of the present invention is to reliably evacuate a cleaning unit installed in each printing unit from a notch using a detection signal from a single rotational position detection mechanism in a multi-color printing machine, and to remove the cleaning unit from the notch. It is an object of the present invention to provide a cylinder cleaning device for a printing press that can avoid interference with the cylinder cleaning device.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of rotating cylinders each having a notch portion for accommodating a mechanism for grasping the end portion of a sheet-like member such as a sheet of paper. a plurality of cleaning units that once separate from the outer circumferential surface of the cylinder so as to avoid the notch, and after the notch has passed, press a cleaning member to the outer circumferential surface of the cylinder to clean dirt from each cylinder, respectively; In a cylinder cleaning device for a sheet-fed printing press, the notch angle of each cylinder, the relative rotation angle difference between each cylinder, the relative rotation angle difference of one cylinder with respect to an arbitrary rotation axis of the printing press, and each means for previously inputting the arrangement angular position of each cleaning unit with respect to the cylinder as angular data; means for generating a timing pulse at a predetermined rotational position of the rotating shaft; and a notch of each cylinder based on the angular data and timing pulse. Estimate and calculate the angular position of
The present invention proposes a cylinder cleaning device for a printing press that includes means for outputting an operation command to each cleaning unit.

[Effect] In the present invention, the notch angle of each cylinder.

The relative rotation angle difference between each cylinder, the relative rotation angle difference of one cylinder with respect to an arbitrary rotation axis of the printing press, the angular position of each cleaning unit with respect to each cylinder, etc. are input in advance as angle data, and one side , a timing pulse is generated at a predetermined rotational position of one of the rotating shafts in the printing press, and based on the angle data and the timing pulse, the angular position of the notch of each cylinder is estimated and the operation command is issued to each cleaning unit. First, since it is not necessary to provide a means for detecting the notch of the cylinder for each printing unit, the overall system configuration becomes simple.

Also, even when adjusting the timing of relief of the notch,
It is only necessary to change the angle data input in advance, and there is no need to mechanically move or adjust the detection mechanism for each printing unit.

Furthermore, even if a part of the printing unit is replaced after adjustment, it is only necessary to change the angle data, which eliminates the need for mechanical readjustment.

Therefore, in a multi-color printing press, the cleaning unit installed in each printing unit is reliably evacuated from the notch by the detection signal from a single rotational position detection mechanism, and interference between the cleaning unit and the notch is prevented. It can be avoided.

[Example] Next, an example of the present invention will be described with reference to FIGS. 1 and 2. Here, the present invention will be explained by taking an impression cylinder cleaning unit as an example, but the present invention can also be applied to a cleaning device for various cylinders such as an impression cylinder of a two-blanket cylinder rotary press or a blanket cylinder as long as the cylinder has a notch. It is clear that it can be applied.

FIG. 1 is a diagram schematically showing the system configuration of an embodiment in which the present invention is applied to an impression cylinder washer of a multicolor sheet-fed printing machine.

In this case, there are printing units 30 for four colors, and each printing unit 30 is provided with one cleaning unit 40. Each cleaning unit 40 is connected by a connector 50 to a cleaning liquid tank 60 and an air supply source (not shown). This coupler 50 is connected to the arithmetic unit CPU via the input/output interface I10 of the controller 70.
and connected to memory. The controller 70 controls the rotation of any printing press, e.g. once per revolution, from a single timing sensor 90 which generates a timing pulse at a predetermined rotational position of the rotary shaft 31 of the impression cylinder 2 of the first color printing unit 30. Capture the timing signal that is output. Further, various angle data etc. input from the operation panel 80 using a keyboard, for example, can be taken in. The angle data, calculation results, etc. that are input in advance are stored in a memory within the controller 70 and are retained as long as there is no need to change them.

Now, in the impression cylinder cleaning apparatus of this embodiment configured as described above, first, various angle data of the printing press are inputted from the operation panel 80. The angle data to be input includes the angle of the notch 4 of each impression cylinder 2, the relative rotation angle difference between the impression cylinders 2 of each printing unit 30, and the rotation axis 31 of the first color printing unit 30.
The relative rotation angle difference of the first color impression cylinder with respect to the timing pulse generation reference position, the angular position of each cleaning unit 40 with respect to each pressure 1] 12, etc. are input in advance as angle data. Since these angle data are fixed unless the printing unit 3o and cleaning unit 40 of the target printing press are changed, they are stored and saved in the memory within the controller 70.

When actual printing starts, a timing signal output from the timing sensor 90 once per rotation at a predetermined rotation angle position of the rotation shaft 31 of the first color printing unit 30 is captured.

The controller 70 creates an angular timing map of the impression cylinder 2 in each printing unit 30, as shown in the upper half of FIG. 2, based on the captured timing signal and angle data inputted in advance.

The controller 70 also creates a cleaning program, as shown in the lower half of FIG. here.

To avoid complications, the second to fourth color printing units 30
Although not shown, the cleaning program is similar to the cleaning program for the first color printing unit 30. The cleaning program is a program that sets the number of times the cleaning unit 40 is brought into contact with the impression cylinder 2, the number of times the cleaning liquid is sprayed, the number of times the cleaning cloth 14 is fed, etc. in one cleaning cycle. It is desirable to set several types in advance so that the user can select according to the degree of the problem.

When cleaning is started by a user's operation, the cleaning program synchronizes with the timing map of each printing unit 30 and performs the cleaning operation.

The signal from the controller 70 in FIG.
The cleaning unit 40 is retracted through the notch 4.

Since the timing map is determined as a function of the rotation angle of the printing press based on the timing signal, the position of the notch on the map does not change even if the operating speed of the printing press changes.

In this embodiment, the positional relationship between the impression cylinder 2 to be cleaned and the cleaning unit 4 is determined by the arithmetic unit gCPU in the controller 70.
Since the position of the notch 4 is clearly understood within the computer and the position of the notch 4 is strictly controlled by the calculation device, when creating a cleaning program, the cleaning cloth 14 is finely fed at the beginning of cleaning, and the position of the notch 4 is precisely controlled by the calculation device. The cleaning cloth 14 is fed in a large distance, and the entire circumference of the impression cylinder 2 except the notch 4 is finished cleaned with the clean part of the cleaning cloth 14 that is fed in a large amount, and the cleaning is completed with one operation of the cleaning unit 40. However, by feeding the cleaning cloth 14 in the middle of the impression cylinder 2, it is also possible to eliminate the stain stripes that have conventionally occurred. Therefore, you can create cleaning programs freely.
The cleaning effect is increased and the cleaning cloth can be used efficiently.

Note that in the above embodiment, a cleaning unit in which a cleaning cloth soaked in cleaning liquid is pressed into contact with a cylinder has been described.
It is obvious that the present invention can be applied to a cleaning device using a rotating brush containing a solvent, as long as it is necessary to avoid interference between the cleaning unit and the notch of the cylinder to be cleaned. .

[Effects of the Invention] According to the present invention, the notch angle of each cylinder, the relative rotation angle difference between each cylinder, the relative rotation angle difference of one cylinder with respect to an arbitrary rotation axis of the printing press, and the The arrangement angular position of the cleaning unit, etc. is input in advance as angular data, and on the other hand, a timing pulse is generated at a predetermined rotational position of the rotating shaft, and based on the angular data and timing pulse, the notch of each cylinder is adjusted. Since the angular position is estimated and the operation command is output to each cleaning unit, firstly, there is no need to provide means for detecting the notch in the cylinder for each printing unit, and the overall system configuration becomes simple.

Also, even when adjusting the timing of relief of the notch,
It is only necessary to change the angle data input in advance, and there is no need to mechanically move or adjust the detection mechanism for each printing unit.

Furthermore, even if a part of the printing unit is replaced after being placed on the stand, it is only necessary to change the angle data, which eliminates the need for mechanical readjustment.

Therefore, in a multi-color printing press, the cleaning unit installed in each printing unit is reliably evacuated from the notch by the detection signal from a single rotational position detection mechanism, and interference between the cleaning unit and the notch is prevented. It can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the system configuration of an embodiment of the cylinder cleaning device for a printing press according to the present invention, FIG. 2 is a timing chart showing an example of the timing map and cleaning program of the embodiment in FIG. 1, and FIG. FIG. 4 is a side view and a perspective view showing the general relationship between the impression cylinder and the impression cylinder cleaning unit, respectively;
Figure 5 shows the positional relationship between the notch and the cam in the conventional system where the cleaning unit is retracted by a cam, and Figure 6 is a diagram showing the positional relationship between the notch and the cam in the conventional system where the cleaning unit is retracted using the notch position signal from the detection sensor. FIG. 7 is a diagram showing the relationship between the notch and the arrangement position of the detection sensor, and FIG. 7 is a diagram showing an example of the relative angular positional relationship of the impression cylinder notch in a multicolor printing press. 2... Impression cylinder, 4... Notch, 6... Paper presser claw. 8A, 8B... Side plate, 10... Cloth supply roll, 12... Cloth winding roll, 1
4...Cleaning cloth, 16...Support bar 18...Cleaning liquid spray bar 2o...Pressure pad, 30...Printing unit, 31...Rotating shaft, 40...
・Cleaning unit, 50... Connector, 60... Cleaning liquid tank, 70... Controller, 80... Operation panel,
90...Timing sensor.

Claims (1)

[Scope of Claims] 1. A plurality of rotating cylinders having a notch portion for accommodating a mechanism for grasping the end of a sheet-like member such as a sheet of paper, etc., are arranged so as to avoid the notch portions of the rotating cylinders. A cylinder of a sheet-fed printing press that includes a plurality of cleaning units that are once separated from an outer peripheral surface, and after the notch has passed, a cleaning member is pressed against the outer peripheral surface of the cylinder to clean dirt from each cylinder. In the cleaning device, a notch angle of each cylinder, a relative rotation angle difference between each cylinder, a relative rotation angle difference of one of the cylinders with respect to an arbitrary rotation axis of the printing press, and each of the cleaning units for each cylinder. means for previously inputting the arrangement angular position of the cylinder as angular data; means for generating a timing pulse at a predetermined rotational position of the rotating shaft; and means for determining the angular position of the notch of each cylinder based on the angular data and the timing pulse A cylinder cleaning device for a printing press, comprising means for calculating an estimate and outputting an operation command to each of the cleaning units.