JPH0796297B2 - Measuring member - Google Patents

Abstract

A metering strip (12) for an inking unit of a printing machine for metering printing ink, in particular a scraper blade or a doctor blade, is fastened in a swivellable holder and has a cylindrical end (13) which has a radius in the range between 0.3 and 1.5 mm and which, pressed onto an inking roller (6), forms, with said roller, a metering gap for the printing ink to be metered. Axially running cutouts (14), formed on either side of the metering strip (12), adjoin the cylindrical, wear-resistant end (13) which covers an angular region of more than 180 DEG . <IMAGE>

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inking mechanism of a printing press, and more particularly to a measuring member for an inking mechanism of this type.

[0002]

2. Description of the Related Art In a known printing machine, a strip of paper to be printed is passed between two rotating cylinders of an inking mechanism and printed. At least one of the two cylinders is constructed as a rubber cloth cylinder onto which the printing ink is transferred via another pre-switched rotary cylinder or roller of the inking mechanism. Printing ink (which may be highly viscous) is applied on the first of these rollers and is optionally transferred via other rollers to a so-called blanket cylinder. In order to collect the printing ink, the ink application roller may be partially immersed in the printing ink bath and the ink may be carried by rotation, or an appropriate ink application device may be used over the entire width of the ink application roller. May be arranged close to each other. The ink film thus formed on the inking roller must be adjusted to the desired thickness by means of a corresponding weighing device. This is usually done by means of so-called scraper blades or doctors, these scraper blades or doctors extending along the circumferential length which is used together for the inking of the inking roller, with respect to said roller. Pressed.

A scale-out device for the inking mechanism of a printing press for scraping a pre-scaled ink film on an inking roller to the required thickness for subsequent transfer onto a half cylinder. Is known from DE-C 37 14 936. This measuring device has at least one measuring member that extends along the ink application roller and is pressed by the roller. The measuring member is arranged substantially in the radial direction with respect to the ink application roller, and a measuring gap is formed between the roller and an end of the measuring member facing the roller. The end of the measuring member facing the roller is shaped like a cylinder. To change the engagement angle of the metering member with respect to the roller, the metering member can pivot about an axis of the cylinder defined by the cylindrical shaping end. In order to allow the metering member to pivot about this axis within a limited angular range, the metering member has, in its front face, a pivot pin in the cage (the axis of rotation of which is Aligned with the axis of the cylinder defined by the cylindrically rounded ends). It is assumed that the embodiments of the weighing element disclosed by this document, and the weighing device including this type of weighing element, are known, including the so-called retainer for the weighing element.

A disadvantage of the metering element known from DE-C 37 14 936 is that it is structurally limited and has a relatively small pivot angle of less than 30 ° about the central axis, ie ± 15 °. It is clear that it is not allowed. This is because otherwise greater pivoting of the metering member would result in an unreasonable widening of the metering gap between the roller and the metering member. This would also result in an undesirable change in the thickness of the ink applied on the roller. On the other hand, however, the more viscous the printing ink used, the more advantageous the pivoting at an angle greater than 30 ° mentioned above. More specifically, in the case of a measuring member having a small pivot angle, particularly in the case of using a highly viscous printing ink, ink which is scraped off from the measuring member and flows freely in the edge region between the roller and the measuring member. Will cause stagnation.

Furthermore, in order to protect the very precisely machined measuring end of the measuring member, DE-C 37 14 936.
It is proposed to cover the metered end with a flexible foil sheet which is fixed so that it can be replaced easily and easily. As a result, wear resistance comes at the expense of high structural costs that require an additional restraint device for the foil-like wear resistant sheet.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a printing press having a hard printing plate.
Inks for ink jet devices, especially for short offset ink devices
Although it is a measuring device, it has a special structure despite its simple structure.
When using highly viscous ink, make sure that an accurate measurement gap
While setting, it is scraped and deposited on the ink application roller.
Metering unit that guarantees free discharge of excess ink
The task is to create materials.

[0007]

SUMMARY OF THE INVENTION According to the present invention, the above problems are met by a printing press ink having a smooth inking roller.
Dispensing printing ink for equipment, especially for short ink equipment
A scraper blade or doctor
An extension member, which is (a) fixed in a pivot retainer,
(B) A wear-resistant cylindrical imprinting end 13 having a radius (R) in the range of 0.3 to 1.5 mm is provided, and (c) the cylindrical imprinting end is attached to the ink application roller 6. In the case of being pressed to form a measuring gap for the printing ink to be measured, (d) the cylindrical shaping end portion 13 covers an angle range larger than 180 °, and (e) the cylindrical shaping end portion is measured. An axially extending underside formed on both sides of the projecting member.
It is solved by a measuring member followed by a cut 14.

An advantage of the present invention is that the metering member is ink coated.
Cylindrical mold end facing the cloth roller has an angle of 180 ° or more
Covering the area and said cylindrical endTo, Measuring unit
Axial extension formed on both sides of the materialundercut
It is continuingObtained based on that. Measuring the present invention
The cylindrical end of the shank is better than solutions known in the art.
Since the cover covers a much larger angle range, the measuring member is pivotal.
Movable angular range without unwanted side effects
It can be effectively expanded. That is, the cylindrical end of the measuring member
Part separates from the surface of the inking roller, which is why
With side effects such as undesired widening of the gap
Absent.Above all,When using high viscosity printing inkIs
Free inkTo make the fluid flowAs large a corner as possible
Pivoting in degrees is desired. In contrast to the known measuring members
Thus, the weighing member constructed according to the present invention is truly
From the standard position in the radial direction with respect to the coating roller,
It can pivot about an angle of ± 90 °. Measuring the present invention
Since the member can pivot in a large angle range,
Relatively large due to the oscillating motion of the projecting memberRubbingWorking
Ink that has been mixed, especially with high viscosity, should be
It is evenly distributed in the contact area of the measuring member. In the present invention
Follows the cylindrical end of the following metering memberundercut
Is the ink that has been scraped, ThisFrom the cylindrical end ofAnda
-CutAnd thenWithout stagnation from thereOf measuring member
It passes through the subsequent part that acts as a guide for the ink.
G It acts so that it can be returned to the container.Underka
TheIs connected to the end of the cylindrical shape,
Similarly for the desired large pivoting range of.
The structural advantages of the present invention include:
Abrasion resistance of cylindrical end of materialToFurther encouragement
Be done. Because, for example, with a wear-resistant foil sheet
Coating the cylindrical endAbandonmentBecause you can. Further details
Simply put, the measuring member covered with this kind of sheet is a book
To achieve the structurally limited advantages of the invention, multiple
It will have a crude structure.

The cylindrical shaping end of the metering element according to the invention preferably covers an angular range between 200 ° and 280 °, in particular about 250 °.

The transition range between the cylindrical shaping end of the measuring member and the undercuts arranged on both sides may be formed continuously. That is, the cylindrical shaping end extending undercut or groove rounded at tangential extension, the groove is not adapted to migrate <br/> to successive portions of the out instrument again member, The printing ink that has been scraped out
It may be adapted to be allowed to drain through this portion to be captured in a collection tank or the like .

In the present invention, the measuring member may be constructed as a partial piece, or at least a cylindrical shaping end portion,
A multi-piece section of a part located in the pivotable retainer, which part projects into the retainer from the cylindrical shaping end, and a part in which the undercut is provided, these being a suitable method May be firmly connected to each other. However, a one-piece weighing member is a particularly preferred implementation. This is because in this case the highest precision can be achieved, in particular with respect to the total length of the weighing element. More specifically, size-related compatibility issues that result from multi-piece joining, such as gluing or welding, are avoided. For example, in a multi-page width measuring member such as used in so-called panoramic printing,
This advantage of some pieces comes into play.

The range of contact area with the ink application roller and
And deployed on both sides in the pivot cageundercutTogether with
In the part protruding toOf the present inventionMeasuring memberShape of
Is suitable for die grinding, milling, spark discharge corrosion and other
It can be produced by an appropriate method.

In order to achieve the desired wear resistance, the metering member can be constructed of a suitable solid material, but especially only the cylindrical shaping end, for example ceramic, sintered metal or other wear resistant composites. It is particularly advantageous to be made wear resistant by the use of a suitable metal such as a substance. Also, it suffices if only its surface is made wear-resistant, which is advantageously done by application of a suitable layer of, for example, carbide, nitride, oxide or the like.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. The printing mechanism of a known offset rotary press, shown diagrammatically in FIG. 3, comprises a blanket cylinder 1 on which an impression cylinder 2 is arranged. Thus, the impression cylinder 2 may be formed as another blanket cylinder. A strip of paper 3 to be printed is passed between blanket cylinder 1 and impression cylinder 2 and printed. An inking roller 6 having an elastic surface is in contact with the plate cylinder 4, and the plate cylinder is
It works so as to transfer the ink from the ink application roller 6 onto the blanket cylinder 1. On the ink application roller 6,
The ink applicator 7 forms a pre-measured ink film 8 having a uniform thickness over the entire width of the ink applicator roller 6. The thickness of the ink film 9 can be transferred onto the plate cylinder 4. Much larger than thickness. The ink application device 7 is the same as the ink groove 1 in the above embodiment.
0, and the ink groove is provided with an ink discharge adjusting plate 11 which determines the amount to be measured and can be adjusted by a known method. A part of the ink film 8 which is taken out in advance by the ink applying roller 6 is scraped off by a measuring member 12 arranged behind the ink applying device 7.
Thus, the measuring member 12 is placed at a normal position substantially perpendicular to the ink applying roller 6, that is, in the radial direction. Thus, an ink film 9 is formed which can be transferred onto the plate cylinder. The excess ink 13 scraped off by the metering member 12 flows along the metering member 12, otherwise freely into a collecting container 14 from which it is pumped back to the inking device 7.

The ink film 9 which can be transferred onto the plate cylinder 4 has a constant thickness over the entire width of the ink application roller 6.
This thickness can be adjusted by the strength of the engagement of the measuring member with the ink application roller 6 to some extent. This can be done by a well-known adjusting mechanism, not shown.

FIG. 2 is a sectional view of the ink applying roller 6, which is in contact with the measuring member 12. The ink application roller 6 includes an elastic coating 16 and rotates in the direction of arrow D. Measuring member 12
Has a cylindrical surface at the end 13 facing the ink application roller 6. The axis 17 of the cylindrical surface is the axis of rotation about which the metering member 12 is pivoted by the angle α.

FIG. 1 shows a scale-out member 12 which is cylindrically shaped over an angular range W and which has an end 13 with a radius R. This end, there <br/> Following undercut 14 which runs formed on both sides of the out scale member axially. The undercut 14 has a substantially V-shape, and the cylindrically formed portion 13 is adapted to move to the undercut 14 on both sides in a substantially tangential extension. Of out the scale member 12, both sides of the under
The narrowest portion defined by the cut 14 is rounded to facilitate the outflow of the scraped ink. Thus, the metering member 12 provides a flow surface that extends substantially continuously to the scraped printing ink.

The radius R of the cylindrically shaped end 13 is
It is in the range of 0.3 to 1.5 mm. In this case, this cylindrical end covers an angular range W greater than 180 °. In the exemplary embodiment, this angular range W amounts to approximately 250 °.

As is clearly shown in FIG. 2, the scale-out member 12 is a cast, in particular cylindrical end 13 covering over 180 °, and this cylindrical shaping on both sides of the scale-out member. As a result of the construction with the undercut 14 following the end 13, it can pivot within a wide angular range α, thereby allowing any desired engagement with the inking roller 6. Therefore, the angular range α available for pivoting the metering member 12 can extend to almost ± 90 ° with respect to the standard position without undesirably hindering the free outflow of the scraped ink film.

While the present invention has been described in terms of a preferred embodiment, it will be apparent to those familiar with the art that:
It should be understood that various changes and modifications can be made within the scope of the technical idea of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a measuring member that covers an angle range of 180 ° or more and has cylindrical shaping ends following undercuts formed on both sides of the measuring member.

2 is a schematic diagram of a pivoted weighing member according to FIG.

FIG. 3 is a schematic diagram of a printing mechanism of a known offset rotary press having an ink and dampening mechanism and a known weighing device.

[Explanation of symbols]

1: Rubber cloth cylinder 2: Impression cylinder 3: Strip paper 4: Plate cylinder 6: Ink application roller 7: Ink application device 8, 9: Ink film 12: Measuring member 13: Excess ink 14: Undercut

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Robert Imhof 23, Birkenweg, Bern, Switzerland (56) References JP-A 64-51945 (JP, A) JP-A 59-73952 (JP, A)

Claims (8)

[Claims] 1. A printing machine having a smooth ink application roller.
Printing ink for inking devices, especially for short ink devices
Use a scraper blade or a doctor to
An abrading member, which is (a) fixed in a pivot retainer, and (b) having a radius (R) in the range 0.3 to 1.5 mm, of wear-resistant cylindrical shaped end 13 (C) the cylindrical imprinting end is pressed by the ink application roller (6) to form a measuring gap for the printing ink to be measured out, (d) the cylindrical imprinting end ( 13) covers an angular range larger than 180 °, and (e) axially extending undercuts (1 ) formed on both sides of the measuring member (12) at the cylindrical shaping end.
4) The measuring member characterized by continuing . 2. The weighing member according to claim 1, wherein the angular range W lies between 200 ° and 280 °, in particular about 250 °. 3. The cylindrical shaping end (13) and the angler.
The measuring member according to claim 1 or 2, wherein a transition portion between the dark cut (14) and the dark cut (14) is continuously formed. 4. The scale-out according to claim 1, wherein the cylindrical shaping end portion (13) and the portion 15 projecting into the pivot retainer are constituted by a single piece. Element. 5. The part (1) in which the measuring member (12) projects into at least the cylindrical shaping end and the pivot retainer.
The measuring member according to any one of claims 1 to 3, which is composed of a multi-part piece including 5) and a portion provided with an undercut , and these part pieces are firmly connected to each other. 6. At least the cylindrical shaping end (13).
The surface of is formed to have wear resistance.
The measuring member described in any way. 7. At least the cylindrical shaping end (13).
7. The weigh-out member according to claim 6 , wherein the surface of the member is made of wear-resistant ceramic, sintered metal or synthetic material. 8. The scale-out member according to claim 6 , wherein the wear-resistant surface is formed by a vapor-deposited metal layer.