JPH065168Y2 - Plate dust remover for printing machine - Google Patents

Description

[Detailed Description of the Invention] (a) Purpose of the invention [Industrial field of application] The present invention relates to an automatic plate surface dust removing device for a printing press, and particularly to ink residue, paper dust, etc. adhering to the plate surface during offset printing. The present invention relates to an automatic plate surface dust removing device for removing dust.

[Prior Art] Conventionally, in offset printing, ink residue, paper dust, etc. adhere to the plate surface during printing, and pinhole-shaped white spots (called "Hicky") are generated in the printed matter, so that the operator Although it shuts down the press or is very dangerous. A rod-shaped dust removing tool whose tip is made of a rubber material is brought into contact with the rotating printing plate to perform the removal work. However, since this work causes a decrease in operating rate and is also a dangerous work, some automation devices have been conventionally proposed.

In these conventional devices (see, for example, Japanese Patent Laid-Open No. 59-174362), when an operator finds a missing portion on a printed matter, the position is specified in correspondence with the number given in advance in the width direction of the plate. , A mechanism is adopted that automatically operates a dust removing device installed facing the plate by pressing a button at a corresponding position on the operation panel. Then, the dust removing device is provided with a removing head portion configured to bring a part of the peripheral edge of a disc-shaped member made of an elastic material such as rubber into contact with the plate surface during dust removal, and then rotate the disc-shaped member a small angle to sequentially contact the plate surface. The moving head moves the removing head portion to a predetermined position on the printing plate.

[Problems to be solved by the invention] However, since the mounting space of each printing press is different in this device, the contact angle between the plate cylinder surface and the desk-shaped member is set to be the same for all printing presses. It was impossible. As a result, even if the contact angle between the plate cylinder surface and the disk-shaped member has a certain degree of allowance, the device must be designed to remove dust on the plate cylinder surface.

(B) Configuration of the Invention [Means for Solving the Problems] In view of the above points, the present invention makes the shape of the disk-shaped member into a bowl shape or a shape in which an angle is provided in the peripheral portion such as a truncated cone, and printing is performed. Set an arbitrary angle according to the mounting state on the machine,
In all printing machines, it is intended to solve the above problems by always making the contact angle between the plate cylinder surface and the disk-shaped member the same.

[Operation] By adopting a bowl shape or a truncated cone shape for the dust removal desk, due to the installation space, even if the attachment position of the dust removal head moves up and down, appropriate disc-shaped members with different side edge angles are used. By doing so, it becomes possible to keep the contact angle with the plate surface constant.

[Embodiment] An embodiment according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an offset rotary printing machine, which has a plate cylinder 2 as is well known, and a dampening water device 3 and an ink roller 4 are provided in contact with the plate cylinder 2. The dust removing mechanism of the automatic plate surface dust removing device, which is an essential part of the present invention, is provided, for example, below the dampening water device 3 in contact with the plate cylinder 2 as shown by reference numeral 5. A dust removal position input device for giving a designation of the dust removal position to the dust removal mechanism 5 can be provided on the occlusal side of the color gamut 8 as indicated by reference numeral 7.

The dust removing mechanism 5 may be installed between the dampening water device 3 and the ink roller 4 instead of being provided on the front side (in the illustrated case) of the dampening water device 3 in the rotation direction of the plate cylinder 2.

The dust removal position input device 7 has a form as illustrated in FIG. 2 as a whole, and has a position input section used by an operator to specify a dust removal position, and detection, calculation, display, and a dust removal mechanism 5 of the dust removal position. And a microcomputer that functions to move the dust removal head to a specified position and control the dust removal operation.

As shown in FIG. 3, the dust removing position input device 7 includes a central processing unit CPU of a microcomputer and a position input unit 1
It has 0, a display unit 11, a memory 12, a motor controller 13 and the like. The dust removal position input data from the position input unit 10 is sent to the central processing unit CPU through the interface I / F.
Is input to, processed there and converted into position data.

This data can also be sequentially stored in the memory 12 so that when there are a plurality of dust removing portions, the dust removing operation can be sequentially performed by sequentially specifying the positions.

The position data is calculated by the central processing unit CPU,
Data for controlling a drive motor, which will be described later, of the dust removing mechanism 5 is converted into, for example, the number of pulses, and the interface I
It is sent to the motor controller 13 via / F. Based on this data, the motor controller 13 uses the dust removal mechanism 5
Control the drive motor of.

The dust removal position input section of the dust removal position input device 7 is the second
As shown by reference numeral 15 in the figure, it is in the form of a flat switch.

The printed matter 18 moves in the direction of the arrow and is positioned and placed by the printed matter addressing frame 16 that matches the printed matter size.

As shown in FIGS. 14 (a) and 14 (b), the dust removal position input unit 15 is a plate formed by sequentially stacking a lower printed circuit board 21, a spacer 22, an upper printed circuit board 23, and a surface sheet 24 from bottom to top. It has a body. As shown in FIG. 5 in which the position input section 15 is shown upside down, the lower printed circuit board 21 has a sieve-toothed circuit in which the reference signal A is constantly input from the central processing unit CPU at a certain sampling cycle. 25 are provided. On the other hand, a large number of position signal extracting circuits B1 to B whose ends are inserted between the adjacent sieve teeth 25a of this circuit 25.
8 are provided. The distance between the intricate circuits is, for example, about 2.5 mm. Also the upper printed circuit board 23
Is provided with a rectangular pattern 26 having the same pitch as the sieve teeth.

As shown in Fig. 2, position input section (flat switch)
When the printed portion 18 is placed on 15 and the white portion is manually pressed, the upper printed circuit board 23 and the lower printed circuit board 21 are brought into contact with each other, and the adjacent circuits of the lower printed circuit board 21 are brought into conduction. . For example, if the portion indicated by P in FIG. 5 is pressed, the input signal is obtained from the boat of the circuit B2. Therefore, the position in the left-right direction with respect to FIG. 2 can be detected from the number of the port from which this signal is obtained and the pitch of the circuit conductors.

Next, details of the dust removing mechanism 5 will be described with reference to FIG.

The dust removing mechanism 5 has a guide rail 27 provided along the entire length of the plate cylinder 2.

Reference numeral 30 denotes a dust removing head, which has a disk shape.
The head 30 is preferably made of an elastic material such as nitrile rubber (NBR). The removal head 30 has a rotation shaft 31,
The rotating shaft 31 is rotatably supported by a slide member 32, and is connected to a drive source 28 such as a solenoid,
The removal head 30 moves back and forth with respect to the plate cylinder surface.

The slide member 32 is movable along the guide rail 27, and is a removal head moving motor fixed to one end of the guide rail.
It is connected to a transmission member 36 such as a wire or timing belt driven by 34. The transmission member 36 is suspended on the pulley 37 at the other end of the guide rail.

When the position of the dust removal portion of the printed matter is designated by pressing the dust removal position input unit 10 (flat switch 15) by the pusher, the removal head moving motor 34 operates under the control of the motor controller 13 to support the dust removal head 30. The sliding member 32 is moved along the guide rail 27 and stops at the designated position.

Then, the dust removing head 30 is advanced toward the plate cylinder 2 by the solenoid 28, whereby the dust removing head 30 is moved.
A part of the peripheral edge of the plate is pressed against the surface of the plate cylinder 2. At this time,
Since the plate cylinder 2 is rotating, the plate cylinder 2 of the dust removing head 30
Dust on the printing plate is removed by the relative movement of.

After a certain contact time, the solenoid removes dust removal head 30
Moves backward from the plate surface, and the dust removal head 30 separates from the plate surface.

At the same time, the removal head 30 rotates by a certain angle to prepare for the next removal operation. In this way, as the dust removal head 30 rotates, the peripheral portion of the removal head 30 on which dust adheres due to dust removal is displaced to a position that does not face the plate cylinder, so that the removal head portion that faces the plate cylinder always receives ink or Keeps dust free.

Next, FIG. 7 for details of the dust removing head 30 according to the present invention
This will be described with reference to (a) and (b).

The shape of the disk-shaped member that comes into contact with the plate body surface of the dust removal head 30 is a bowl shape 38 with an angle at the peripheral edge portion as shown in (a), or a truncated cone shape as shown in (b). It looks like 39.

An example in which the bowl-shaped disc-shaped member 38 is used for the dust removing head 30 will be described with reference to FIGS. 8 (a) and 8 (b).
In the figure, when the angle A formed by the side edge 38a of the bowl-shaped disc-shaped member 38 and the normal line of the plate cylinder 2 is the optimum mounting angle, when the bowl-shaped disc-shaped member 38 having the same shape is used in FIG. Since the angle formed by the normal of the plate cylinder changes, in this case, use the bowl-shaped disc-shaped member 33 having the raised side edge 38a so that the angle formed by the side edge 38a and the normal becomes A. Due to
Regardless of the mounting position of the dust removing head 30 on the printing machine, the contact angle A between the plate cylinder surface and the peripheral edge of the disc-shaped member 38 can be kept constant. The same applies to the case of using a truncated cone disk-shaped member 39 (a truncated cone type includes not only a truncated cone whose side wall surface is linear but also a curved truncated cone).

(C) Effect of the invention As described above, the shape of the dust removal desk is bowl-shaped,
Alternatively, by adopting a truncated cone shape, even if the mounting position of the dust removal head goes up and down due to the installation space, by selecting and using a disc-shaped member with a different side edge angle, the contact angle with the plate surface can be improved. Since it can be kept constant, the dust removal head can always be installed on the plate cylinder under optimum conditions.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the relationship between the plate surface dust removing device of the present invention and a printing machine, and FIG. 2 is a perspective view of a dust removing position input device,
Fig. 3 is a block diagram of the dust removal position input device, and Fig. 4 is a cross-sectional view of the dust removal position input unit. FIG. 6 is a perspective view of a main part of the dust removing mechanism, FIGS. 7 (a) and 7 (b) are a plan view and a sectional view showing the shape of the disk-shaped member according to the present invention, and FIG. 8 (a) ( FIG. 2B is a side sectional view showing a state in which the dust removing head according to the present invention is installed at a different position with respect to the plate cylinder. 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 section, 12 ... Memory, 13 ... Motor controller, 15 ... Flat switch, 18 ... Printed matter, 21 ... Lower printed circuit board, 22 ... Spacer, 2
3 ... Upper printed circuit board, 24 ... Surface sheet, 25 ...
Sieve-shaped circuit, B1 to B8 ... Circuit lead wire for extracting position signal,
27 ... Guide rail, 28 ... Solenoid, 30 ... Dust removal head, 32 ... Sliding member, 34 ... Dust removal head moving motor, 36 ... Transmission member, 38 ... Bowl type disk,
39 ... A truncated cone type disc.

Claims (1)

[Scope of utility model registration request] 1. A disc-shaped member of a dust removing head, which is a slide member that is movable left and right on a guide rail along a plate cylinder so as to be movable back and forth with respect to the plate cylinder, is a bowl type or a truncated cone type. Depending on the mounting position of the dust removal head on the plate cylinder, the bowls with different side edge angles can be set so that the angle between the side edge of the disc-shaped member and the normal to the plate cylinder that contacts it can always be set to a constant angle. A plate surface dust removing device, wherein a disk-shaped or frustoconical disk-shaped member can be replaced and attached to the slide member.