JPH0733081B2 - Ink scraping device for printing machine and blade mounting method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a printing machine such as an offset printing machine. In particular, the present invention relates to an ink scraping device for making the ink supplied to a plate cylinder, a blanket cylinder, etc. uniform in the axial direction of each cylinder. Further, the present invention relates to a method of mounting a blade used in the ink scraping device.

[Prior Art] In a general printing machine, ink contained in an ink container is supplied to a plate cylinder or a blanket cylinder through a rotating body such as a fan roller, a metering roller, an ink cylinder, and the like. Printing is performed on a printing medium such as printing paper by a cylinder or a blanket cylinder.

In that case, if the ink sent to the plate cylinder or the like is not a layer having a uniform thickness in the axial direction of the plate cylinder or the like (that is, the width direction of the printing paper), uneven printing appears on the printing paper, which is preferable. Absent. In order to avoid this, a technique has conventionally been adopted in which a blade, which is a thin plate material, is brought into contact with a rotating body such as a metering roller to remove excess ink on the rotating body.

However, conventionally, the blade is fixed to a position facing the rotating body by simply tightening the blade on the machine frame with a bolt or the like. This fixing method has a drawback in that the blade is wavy and the ink cannot be scraped to an accurate layer thickness.

Further, since the blade is fixed with a plurality of bolts, the work of mounting and removing the blade is troublesome. The above-mentioned work was extremely troublesome because a large number of devices were arranged inside the printing machine and they were stained with ink.

[Problems to be Solved] The present invention makes it easy to attach and detach the blade,
Moreover, it is an object to provide an ink scraping device capable of forming an ink layer having a uniform layer thickness on a rotating body.

Another object is to install the blade easily, reliably and safely.

[Means for Solving the Problems] A means for solving the above problems is an ink scraping device that scrapes off excess ink adhering to the outer periphery of the rotating body, and is arranged substantially parallel to the rotating body. ,
A blade shaft having a recess formed in the axial direction, a blade supporter having a protruding portion formed at the front end and a rear end fitted into the recess to be fixed to the blade shaft, and the blade supporter fitted into the recess A blade insertion groove formed between the blade supporter on the protruding side of the protrusion and the recess, and the rear end is fitted into the blade insertion groove in a state where the intermediate portion is in contact with the protrusion and bent. And a blade provided with the blade.

Further, a blade mounting method used in the ink scraping apparatus having the above-mentioned configuration, wherein a pressing jig having a recess is used, and the blade is bladed by the pressing jig while the tip of the blade is inserted into the recess. A blade mounting method characterized by inserting the blade into an insertion groove.

In the above configuration, the rotating body is any rotating body arranged from the ink container containing the ink to the plate cylinder. In an ordinary printing machine, the metering roller corresponds to this rotating body. Therefore, the blade, the blade shaft, and the like can be arranged corresponding to the metering roller.

[Operation] The blade (13) is bent and inserted into the blade insertion groove (18) in the blade shaft (11). Therefore, the blade is fixed to the blade shaft by its elastic force.

Various methods are conceivable as means for bending the blade (13). For example, a protruding portion (19) protruding beyond the blade insertion groove (18) to a position slightly higher than the groove.
Can be provided, and the blade can be forcibly warped by the protrusion.

The pushing jig (30) is used when inserting the blade into the blade insertion groove. The pushing jig is provided with a recess (31) into which one end of the blade is inserted. In this state, the operator pushes the blade into the blade insertion groove via the pushing jig.

[Embodiment] FIG. 1 is a schematic view of a main part of an offset printing machine using an ink scraping apparatus according to the present invention. In the figure,
The ink 2 contained in the ink container 1 is sent to the plate cylinder 8 via the fan ten roller 3, the metering roller 4, the crossing roller 5, the ink cylinder 6 and the inking rollers 7, 7. The ink on the plate cylinder 8 is once transferred to the blanket cylinder 9 and then transferred onto the paper fed from the direction of arrow A, whereby printing is performed. Each roller and cylinder rotate in the direction of the arrow.

The ink scraping device 10 is attached to the metering roller 4 as a rotating body. This ink removal device 10
As shown in FIG. 2, the blade shaft 11 arranged substantially parallel to the metering roller 4, the blade supporter 12 fixed to the blade shaft 11, and supported by the blade shaft 11 and the blade supporter 12. And a blade 13 whose tip is in contact with the metering roller 4. The blade shaft 11 is supported at both ends by brackets 14 fixed to a machine frame (not shown). Reference numeral 15 is a set screw for fixing the blade shaft 11 to the blanket 14. As shown in FIG. 4, the blade shaft 11 and the blade 13 attached thereto have the same length as the metering roller 4. In FIG. 4, the blade 13 and the metering roller 4 are separated from each other for the sake of explanation, but in actuality, they are in contact with each other as shown in FIG.

In FIG. 1, the ink drawn up by the fan ten roller 3 adheres to the metering roller 4. The ink initially deposited has a non-uniform layer thickness in the axial direction (that is, the direction perpendicular to the paper surface). The blade 13 in contact with the metering roller 4 scrapes off unnecessary ink on the outer circumference of the metering roller to make the ink layer thickness on the outer circumference of the roller uniform.

As shown in FIG. 3, the blade shaft 11 is formed with a recessed portion 16 in the entire axial direction (direction perpendicular to the paper surface), and the rear end of the blade supporter 12 is fitted into the recessed portion.
It is fixed by 17. The thickness T of the blade supporter 12 is determined so that a blade insertion groove 18 is formed between the upper portion of the blade supporter 12 and the blade shaft 11 when the blade supporter 12 is fitted in the blade shaft 11. Further, a protrusion 19 is formed at the tip of the blade supporter 12. The rear end of the blade 13 is fitted into the blade insertion groove 18 described above. In that case, the blade 13 is first inserted into the groove 18 along the protrusion 19 of the blade supporter 12. At this time, since the middle portion of the blade 13 is pressed against the protruding portion 19, the blade 13 is warped upward,
That is, it is fitted into the groove 18 while being bent downward. As a result, the blade 13 is caused to move by its own elastic force.
Fixed at 11. The blade 13 may be made of a flexible and relatively hard material. For example, a thickness of 0.15 to 0.25 mm
SK material (tool steel) can be used. It should be noted that it is preferable that a polishing machine is used to finish with high precision so that the contact with the metering roller 4 becomes uniform.

When inserting the blade 13 into the groove 18, it is dangerous to try to do this with bare hands, as the ink will slip the hand. Therefore, as shown in FIG.
Insert the blade 13 into the blade, and then push the pushing jig 30 in the state as indicated by arrow B to move the blade 13 into the blade shaft.
Can be attached to 11. The length of the pushing jig 30 in the direction perpendicular to the paper surface is not limited to a particular length, but in consideration of the fact that humans use both hands, set it to about the length when the humans open their hands. Good to keep.

The pushing jig 30 is formed by fixing a stepped member 33 on a base material 32, as shown in FIG. Step member
The concave portion 31 is formed between the 33 and the base material 32. At both ends of the base material 32, gripping portions 34, 34 for an operator to hold by hand are provided.

In FIG. 2, the air cylinder 21 is attached to the lower end of the bracket 14.
Are connected. When the air cylinder 21 operates, the bracket 14 is rotated counterclockwise by a slight distance. As a result, a slight gap is formed between the blade 13 and the metering roller 14. Such measures are taken when the printing press is not in operation.

After a long operation, the blade 13 needs to be replaced with a new one. In that case, set screw 15 in FIG.
Is loosened, the blade shaft 11 is rotated counterclockwise, and the blade 13 is moved to a place where an operator can easily perform the work. For example, rotate it approximately 180 degrees. Then, the blade 13 is removed from the blade shaft 11 and a new blade is attached. Since no fixing means such as screws is required, the work is extremely easy.

In the above-described embodiment, as shown in FIG. 3, the blade shaft 11 and the blade supporter 12 are made separately and assembled with each other to form the blade insertion groove 18. However, not limited to this, the blade shaft 11,
The blade supporter 12 and the blade insertion groove 18 can be integrally formed in advance.

[Effect of the Invention] According to the invention of claim 1, the mounting of the blade is completed simply by inserting the blade (13) into the blade insertion groove (18), so that the mounting of the blade is very simple. Further, since the blade can be removed by simply pulling it out, the removing work is very easy.

The mounted blades do not undulate like conventional screwed blades, so they are
An ink layer having a uniform layer thickness can be formed on the metering roller 4).

According to the invention of claim 2, the blade is inserted into the blade insertion groove by using the pushing jig (30) having the recess (31). In this case, the blade is pushed in the state of being inserted into the concave portion, so that the blade is surely mounted in the groove. In addition, it is safer as compared with the case where the worker does it with bare hands.

[Brief description of drawings]

FIG. 1 is a schematic view of an example of an offset printing machine using an ink scraping device according to the present invention, FIG. 2 is a side view showing an embodiment of an ink scraping device according to the present invention, and FIG. 2 is a side view showing a main part of FIG. 2 and a blade mounting method according to the present invention, FIG. 4 is a plan view of an ink scraping device, and FIG. 5 is a perspective view showing an example of a pushing jig. 4: Metering roller (rotating body) 11: Blade shaft, 18: Blade insertion groove 13: Blade, 30: Pushing jig

Claims (2)

[Claims] 1. An ink scraping device for scraping off excess ink adhering to the outer periphery of a rotating body, the blade shaft being arranged substantially parallel to the rotating body and having a recess in the axial direction, A protrusion is formed at the tip, and a rear end is fitted into the recess and fixed to the blade shaft, and a blade supporter is fitted into the recess.
A blade insertion groove formed between the blade supporter on the protruding side of the protrusion and the recess, and a blade whose rear end is fitted into the blade insertion groove with the intermediate portion abutting the protrusion and bent. And an ink scraping device. 2. A blade shaft arranged substantially parallel to the rotating body, and a blade insertion groove provided in the blade shaft,
It has flexibility and its tip has a blade that contacts the rotating body.The above blade is inserted into the blade insertion groove in a bent state, and in this state the blade is fixed to the blade shaft. The blade mounting method used in the ink scraping device described above, in which a pressing jig with a recess is used, the tip of the blade is inserted into the recess, and then the blade is inserted into the blade insertion groove by the pressing jig. A blade mounting method characterized by: