JPH0514616B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic plate surface dust removal device for a printing press, and is particularly used to remove dust such as ink scum and paper dust that adheres to the plate surface during offset printing. This invention relates to an automatic plate surface dust removal device.

[Prior Art] Conventionally, in offset printing, ink scum, paper dust, etc. adhere to the plate surface during printing, resulting in pinhole-like white areas (called hitki) on printed matter, which makes it difficult for operators to This can be done by stopping the printing press or, although this is extremely dangerous, by bringing a rod-shaped dust remover with a tip made of a rubber material into contact with the rotating plate. but,
Since this work reduces the operating efficiency and is also dangerous, partially automated devices have been proposed.

In these conventional devices, when an operator discovers a white area on a printed matter, the operator identifies the location by corresponding to a number previously assigned in the width direction of the printing plate, and displays the corresponding location on the operation panel. By pressing a button, a dust removal device installed opposite the printing plate is automatically activated. and,
The dust removal device includes a dust removal head portion whose tip is made of a blade-like elastic material such as rubber and is brought into contact with the printing plate during dust removal, and a moving portion that moves the removal head to a predetermined position on the printing plate. However, this device has the following drawbacks and has not yet been put into practical use.

[Problems to be Solved by the Invention] That is, the method of specifying the position of the dust removal area on the printing plate is inaccurate, and the dust cannot be removed reliably. The operator looks at the printed matter and identifies the position to be removed by corresponding to the number in the width direction of the plate, and then
As described above, a button on the operation panel is pressed, but if the white area is in the center of the printed matter, problems such as pressing the wrong button may occur because the position of the corresponding operation button must be determined visually.

In order to solve this problem, some dust removal heads are equipped with a scrubbing function, but this is not a practical solution as it leads to a loss of removal time. do not have.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide an automatic plate dust removal device for a printing press that can easily and accurately specify the position of a plate dust removal area.

[Means for Solving the Problems] An automatic plate surface dust removal device for a printing press according to the present invention includes a dust removal head that is freely displaceable along the plate cylinder;
It has a device for moving the dust removal head forward and backward with respect to the plate cylinder, a head moving device for displacing the dust removal head to an arbitrary position along the plate cylinder, and a printed matter placement surface, and a printed matter placed on the placement surface. A dust removal position input section that generates a position data signal corresponding to the pressed position in the direction of the printed matter corresponding to the longitudinal direction of the printing cylinder when the dust removal position of the printed matter is pressed; and position input data from the dust removal position input section; and an arithmetic processing unit for converting data into data for controlling the head moving device so as to move the dust removal head to a position along the plate cylinder corresponding to the pressed position. The dust removal position input section is configured by providing a sheet-like input section on a printed circuit board having a reference signal input circuit and a large number of position signal extraction circuits, and the sheet-like input section is configured as described above when pressing a printed matter. The reference signal input circuit and the position signal extraction circuit are configured to be electrically connected so that a position signal corresponding to the pressed position of the printed matter on the placement surface is extracted.

[Operation] In the above configuration, when a printed matter is placed on the placement surface of the dust removal position input section, the position where dust should be removed is confirmed, and that position is pressed with the pusher, the position data corresponding to the pressed position is displayed. The signal is output from the signal extraction circuit, and the dust removal head is moved to a position along the plate cylinder corresponding to the pressing position by data conversion by the arithmetic processing unit, and dust removal is performed.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an offset rotary printing press, which, as is well known, has a plate cylinder 2;
A dampening water device 3 and an ink roller 4 are provided in contact with. The dust removal mechanism of the automatic plate surface dust removal device, which is a main part of the present invention, is provided, for example, under the dampening water device 3 and in contact with the plate cylinder 2, as shown by reference numeral 5 in the figure. A dust removal position input device for specifying the dust removal position to the dust removal mechanism 5 can be provided below the color booth 8 as shown by reference numeral 7.

Note that the dust removal mechanism 5 may be installed between the dampening water device 3 and the ink roller 4 instead of being provided on the front side of the dampening water device 3 in the rotational direction of the plate cylinder 2 (in the illustrated case). Further, the position input device 7 may be installed separately from the color booth 8 instead of being built into the color booth 8 as shown.

The garbage-picking position input device 7 has the overall configuration as illustrated in FIG. It has a microcomputer that functions to move the dust removal head to a specified position and control the dust removal operation, which will be described later.

As shown in FIG.
It has a position input section 10, a display section 11, a memory 12, a motor controller 13, and the like. The dust removal position input data from the position input unit 10 is input to the central processing unit CPU via the interface I/F, where it is arithmetic processed and converted into position data.

This data is used when there are multiple dust removal parts.
It is also possible to sequentially store the information in the memory 12 so that the dust removal operation can be performed sequentially by sequentially specifying the positions.

The position data is converted into data, for example, the number of pulses, for controlling the later-described drive motor of the dust removal mechanism 5 through arithmetic processing in the central processing unit CPU, and is sent to the motor controller 13 via the interface I/F. The motor controller controls the drive motor of the dust removal mechanism 5 based on this data.

The dust removal position input section of the dust removal position input device 7 is in the form of a support plate, as shown by reference numeral 15 in FIG. This position input section 15
The printed matter feeding device 19, which is provided on a pedestal 17 supported by When the printed matter 18 is placed on the position input section 15 as shown in the figure and the feeding device 19 is operated, the printed matter 18 is placed on the position input section 1.
The printed material 18 is sequentially fed to the destination on the surface of the printed material 5, and by stopping the feeding device 19, the printed material 18 can be stopped at any position in the front and back direction. The feeding device 19 can be operated by an operation button 20.

As shown in FIG. 4, the dust removal device input section 15 includes a plate body configured by laminating a printed circuit board 21, a pressurized conductive sheet 22 functioning as a sheet-like input section, and a protective sheet 23 in order from bottom to top. ing. As shown in FIG. 5, which shows the position input section 15 upside down, the printed circuit board 21 has a comb-like circuit 25 to which the reference signal A is constantly input at a certain sampling period from the central processing unit CPU. It is provided. On the other hand, a large number of position signal extraction circuits B1, . . . , B8 whose ends are inserted between adjacent comb teeth 25a of this circuit 25 are provided. For example, the spacing between mutually intricate circuits is
It is about 2.5mm.

As shown in FIG. 2, when the printed matter 18 is placed on the position input unit 15 and the white part is pressed with a pen-shaped presser, the pressed part of the pressurized conductive sheet 22 becomes conductive. Therefore, printed circuit board 2
1 adjacent circuits become conductive. For example, if the part indicated by P in FIG. 5 is pressed, an input signal will be obtained from the port of circuit B2. Then,
The position in the left and right direction in FIG. 2 can be detected from the port number from which this signal was obtained and the pitch of the circuit conductors.

If signals are obtained from a plurality of ports, one piece of data on the dust removal position can be obtained by calculating the average value (intermediate position information) of the input data using a program as necessary.

Since the maximum size of printed matter is as large as A times (880 x 1250), if the existing color booth is used as a position input section, it will be necessary to remodel the color booth.
On the other hand, if a printed matter feeding device 19 is provided as shown in FIG. 2, the position input section 15 can be downsized in terms of its depth.

Next, details of the dust removal mechanism 5 will be explained with reference to FIG.

The dust removal mechanism 5 has a guide rail 27 provided along the entire length of the plate cylinder 2, and both ends of the guide rail 27 are supported by support members 28. Each of the supporting members 28 has one end supported by a member 29a connected to the other end of an air cylinder 29 fixed to a fixed frame 29b.
As the member 29a moves forward and backward with respect to the plate cylinder 2 by the air cylinder 29, the guide rail 27 also moves forward and backward in the same direction.

Reference numeral 30 denotes a dust removal head which is shaped like a disk. The head 30 is preferably made of an elastic material such as nitrile rubber (NBR). The removal head 30 has a rotating shaft 31 which is rotatably supported by a slide member 32 and connected to a stepping motor 33 by a timing belt or the like. The slide member 32 is movable along the guide rail 27 and is connected to a transmission member 36, such as a wire or timing belt, driven by a removal head movement motor 34 fixed to a support member 28 at one end of the guide rail. The transmission member 36 is connected to the pulley 3 at the other end of the guide rail.
It spans 7.

When the position of the dust removal portion of the printed matter is specified by pressing with the pusher in the dust removal position input section 10, the removal head moving motor 34 is operated under the control of the motor controller 13.
A slide member 32 supporting the dust removal head 30
is moved along the guide rail 27 and stopped at a designated position.

The guide rail 27 is then advanced by the cylinder 29 towards the plate cylinder 2, so that part of the periphery of the dust removal head 30 is pressed against the surface of the plate cylinder 2. At this time, since the plate cylinder 2 is rotating, the dust on the plate surface is removed by the relative movement of the dust removal head 30 and the plate cylinder 2.

After a certain contact time, the guide rail 27 is moved back from the printing plate by the cylinders on both sides, and the dirt removal head 30 is separated from the printing plate.

At the same time, the stepping motor 33 rotates the dust removal head 30 by a certain angle in preparation for the next removal operation. As the dust removal head 30 rotates, the peripheral edge of the removal head 30 to which dust has adhered due to dust removal is displaced to a position where it does not face the plate cylinder, so that the part of the removal head facing the plate cylinder is always free from ink and dirt. Keeps dust free.

Judging from practical results, the rotation angle of the dust removal head 30 is preferably about 5 degrees, and the previous contact portion of the dust removal head with the plate cylinder may partially overlap with the next contact portion. Normally, about 70 consecutive dirt removals are possible with the same dirt removal head.
By doing this, the tip of the removal head, which conventionally had to be cleaned frequently, can be cleaned in one go.
You will only need to do it once a day. It also becomes possible to use the same removal head for one day, then replace it with another removal head, clean it outside the printing press, and reuse it.

[Effects of the Invention] As described above with respect to the embodiments, according to the present invention, a printed matter with a white area is placed on the surface of the input section of the dust removal position input device, and the white area is removed with a presser. Just by pressing it, the dust removal head can be automatically moved accurately to the position corresponding to the dust adhering location on the printing press plate surface, and dust can be removed reliably and easily. Further, in the present invention, when a printed matter is placed on the placement surface of the dust removal position input device and the white part is pressed with a presser, the sheet-like input section such as a pressurized conductive sheet is pressed through the printed matter. However, this sheet-like input section is different from position input using push buttons, etc., and is continuous, and input is made to the sheet-like input section by directly pressing the white part of the printed material, so it is easy to input. It becomes possible to perform accurate input.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the relationship between the automatic plate dust removal device of the present invention and the printing machine, FIG. 2 is a perspective view of the dust removal position input device, FIG. 3 is a block diagram of the dust removal position input device, and FIG. 4 FIG. 5 is a longitudinal sectional view of the dust removal position input section, FIG. 5 is a rear view of the same principle, and FIG. 6 is a perspective view of the dust removal mechanism. 2... Plate cylinder, 3... Dampening water device, 4... Ink roller, 5... Dust removal mechanism, 7... Dust removal position input device, 8... Color booth, 10... Dust removal position input unit, 12 ... Memory, 13 ... Motor controller, 15 ... Dust removal position input section, 18 ...
...Printed material, 19...Printed material feeder, 21...Printed circuit board, 22...Piezoelectric sheet, 23...
Protective sheet, 25... comb-shaped circuit, B1, B2,
..., B8...Circuit conductor for position signal extraction, 27...
... Guide rail, 30 ... Dust removal head, 32
...Sliding member, 33...Stepping motor, 34...Dust removal head movement motor, 36...
...Transmission member.

Claims (1)

[Scope of Claims] 1. A dust removal head movable along the plate cylinder;
It has a device for moving the dust removal head forward and backward with respect to the plate cylinder, a head moving device for displacing the dust removal head to an arbitrary position along the plate cylinder, and a printed matter placement surface, and a printed matter placed on the placement surface. A dust removal position input section that generates a position data signal corresponding to the pressed position in the direction of the printed matter corresponding to the longitudinal direction of the printing cylinder when the dust removal position of the printed matter is pressed; and position input data from the dust removal position input section; an arithmetic processing device that converts data into data for controlling the head moving device to move the dust removal head to a position along the plate cylinder corresponding to the pressed position;
The dust removal position input section is configured by providing a sheet-like input section on a printed circuit board having a reference signal input circuit and a large number of position signal extraction circuits,
The sheet-like input section is configured to conduct the reference signal input circuit and the position signal extraction circuit so that when a printed matter is pressed, a position signal corresponding to a pressed position of the printed matter on the writing surface is extracted. An automatic plate surface dust removal device for a printing press, which is characterized by: 2. The automatic plate surface dust removal device according to claim 1, wherein the reference signal input circuit and the position signal extraction circuit have comb-shaped conducting wires that are intricate with each other. 3. The automatic plate dust removal device according to claim 1 or 2, wherein the sheet-like input section is a pressurized conductive sheet.