JPS5811569Y2 - printing press doctor device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement made to the doctor device of a tampon printing machine belonging to an intaglio printing machine, and is intended to facilitate adjustment of the state of contact of the leading edge of the blade with the plate surface.

By the way, when trying to apply the required amount of ink to the surface of an intaglio printing plate, first apply more than the required amount of ink to the entire surface, and then scrape off the excess ink from the surface. It is customary to do so.

To scrape off such excess ink, a doctor device equipped with a thin plate-shaped blade is often employed, and the blade is scraped off by bringing the leading edge of the blade into close contact with the printing plate and moving it. .

However, when using such a doctor device, care must be taken to ensure that the state of contact of the tip edge of the blade with the plate surface is uniform throughout the metal ridges of the tip edge, and that the blade comes into close contact with the plate surface with equal contact pressure at all locations. However, in reality, it is not easy to achieve such a contact state because it is greatly affected by the finishing accuracy of the blade and blade holder.

Conventionally, the blade holder is equipped with a large number of adjustment screws, for example IO or more, to finely adjust the distortion of the blade, but this requires a great deal of effort and cannot be adjusted in a short time. There were some unavoidable flaws.

The present invention solves the above-mentioned drawbacks of the conventional technology by inserting an elastic body made of rubber or the like between the blade and the blade holder in order to easily adjust the contact state of the blade tip edge with the plate surface of the printing plate. and the pressing plate thereof, and the strain adjustment of the blade by the adjusting screw provided on the blade holder is attempted to be performed via the above-mentioned elastic body.

Hereinafter, an embodiment shown in the drawings will be described in detail.

In the figure, 1 is an ink tray, 2 is a printing plate placed in the tray by suitable means, and 3 is printing ink that is apparently poured into the tray.

However, the printing plate 2 is usually an intaglio plate, and therefore, the plate surface 2a is provided with ink pockets 2b having a shape corresponding to the characters or figures to be printed.

Reference numeral 4 denotes a support frame of the doctor device, which is equipped with a blade holder 5. Reference numeral 6 denotes a wide thin plate-like blade having a width approximating the width of the printing plate 2; A blade pressing body 8 is a fixing screw for fixing the pressing body to the blade holder 5.

However, a rubber-like elastic body 9 and an elastic body pressing plate 10 are interposed between the blade holder 5 and the blade 6, and therefore the blade 6 is
0, it is held between the blade holder 5 and the blade pressing body 7, with only the tip edge 6a protruding downward.

Reference numeral 11 denotes an adjustment screw provided at the lower end portion of the blade holder 5, and is in a position to press the elastic body pressing plate 10, so that the rubber-like elastic body 9 can be pressurized via the pressing plate. .

However, it is not necessary to provide a large number of adjusting screws 11 as in the conventional device, but only a few, for example, three as shown in the figure.
A book is sufficient.

The rubber-like elastic body 9 is made of a material having elasticity with appropriate hardness and a property of not being attacked by the solvent of the ink 3, such as hard synthetic rubber. is made of a material with such hardness that it will not bend even if it is locally pressurized by the adjustment screw 11, for example, a steel plate that is thicker than the blade 6. .

In the above configuration, the support frame 4 is now lowered and the tip edge 6 of the blade 6 is moved as shown by the solid arrow A in FIG.
When the blade a is brought into close contact with the plate surface 2a of the printing plate 2 and moved along the plate surface, the blade tip edge 6a acts to scrape off any other matter present on the plate surface 2a.

Therefore, if the ink 3 in the ink tray 1 is applied in advance onto the plate surface 2a with a brush (not shown), and then the blade tip edge 6a is applied to the plate surface 2a as described above, the excess ink can be removed. The ink is scraped off from the plate surface, and only the required amount of ink remains in the ink pocket 2b.

The blade 6, which has scraped off excess ink as described above, is raised slightly above the plate surface 2a as shown by the dashed arrow in FIG. 1 for the next scraping. It is assumed that the printing plate is moved in the opposite direction to that when taking the printing plate, reaches the end of the printing plate 2a, and is lowered to the printing plate.

On the other hand, the contact pressure of the blade tip edge 6a against the plate surface 2a during ink scraping as described above is made uniform over the gold plate as follows.

First, when the adjustment screw 11 is screwed in, the pressure plate 10 is pressed and pressurizes the rubber-like elastic body 9, and the elastic body uses its restoring elasticity to push the tip edge 6a of the blade 6 against the plate surface 2a. Press down.

At this time, however, the rubber-like elastic body 9 is pressed evenly over the gold mine because the pressing plate 10 is not bent, and therefore the blade 6 is also pressed evenly over the gold mine by the elastic body 9.

In addition, due to distortion of the blade 6 itself, the tip edge 6a
When the printing plate 2a is locally strongly pressed against the printing plate 2a, the rubber-like elastic body 9 is pressed against that part and the printing plate 2a is pressed against the printing plate 2a.
It is corrected and deformed in the direction of retreating from.

Therefore, the state of contact of the blade tip edge 6a with the plate surface 2a is uniform across the gold mine due to the uniform pressurization of the rubber-like elastic body 9 by the pressing plate 10 and the strain absorption effect of the blade 6 exerted by this elastic body 9. You will be shut down.

However, adjustment screw 1 is required to achieve this kind of contact state.
1 is averaged and indirectly applied to the blade 6 via the pressure plate 10 and the elastic body 9, so the number of adjustment screws 11 required is small, and in most cases, the adjustment screws at both left and right ends are The above-mentioned good contact condition can be achieved just by making adjustments.

As described above, the present invention interposes a rubber-like elastic body and a hard pressing plate between the blade and the blade holder, so that the pressing force of the adjustment screw can be applied evenly to the gold plate of the blade, and at the same time Since the purpose is to absorb the distortion of the blade when it comes into contact with the plate, the present invention makes it possible to make the state of contact of the tip edge of the blade with the plate surface uniform throughout the gold plate, thereby eliminating unnecessary The ink can be scraped off well, and the contact state can be easily adjusted with only a few adjustment screws, so it does not require any effort. .

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view showing an embodiment of the present invention, and FIG. 2 is a cutaway front view taken along line A--A in FIG. 1. 5... Blade holder, 6... Blade, 7... Blade pressing body, 9...
Rubber-like elastic body, 10... Elastic body pressing plate, 11.
·····Adjustment screw.

Claims (1)

[Scope of utility model registration request] A rubber-like elastic body having appropriate elasticity and a hard elastic pressing plate are interposed between the blade attached to the blade holder by the blade pressing body and the blade holder, and the blade holder is provided with a rubber-like elastic body having appropriate elasticity and a hard elastic pressing plate. A doctor device for a printing press, characterized in that the pressing force of the adjustment screw is applied from the pressing plate to the blade via a rubber-like elastic body.