JPH0623963A - Weighing member - Google Patents

Abstract

PURPOSE: To provide a metering member to meter printing ink for an ink device of a printing press. CONSTITUTION: A printing ink metering member such as a scraper blade or doctor blade is fastened in a pivoting holder and has a cylindrically shaped edge 13 with a radius(R) in the range between 0.3 and 1.5 mm. The edge is pressed against an inking roller and forms a gap with the roller for the printing ink to be metered. Axial recesses merge on both sides of the metering member with the cylindrically shaped, wear-resistant edge that covers an angular range of more than 180 deg..

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 It is an object of the present invention to provide a metering member for the inking mechanism of a printing press, while avoiding the drawbacks known in the prior art. In particular, especially when using highly viscous inks, this kind of metering of a simple construction ensures an accurate metering gap while guaranteeing a free outflow of excess ink applied and scratched on the inking roller. An attempt is made to provide a delivery member.

[0007]

According to the present invention, there is provided a scale-out member for a printing press inking device such as a scraper blade or a doctor, which is fixed in a pivot holder. (b) A 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 pressed against the ink application roller 6 to be measured. (D) the cylindrical shaping end 13 covers an angle range larger than 180 °, and (e) the cylindrical shaping end is formed on both sides of the measuring member. This is solved by a measuring member in which the recess 14 extending in the axial direction is continuous and (f) the cylindrical shaping end is configured to be wear-resistant.

An advantage of the present invention is that the cylindrical shaping end of the metering member facing the inking roller covers an angular range of 180 ° or more, and the cylindrical end is on both sides of the measuring member. It is obtained based on the fact that it is connected to the axially extending recessed portion. Since the cylindrical end of the metering member of the present invention covers a much larger angular range than solutions known in the art, the angular range over which the metering member can pivot effectively expands without undesirable side effects. it can. That is, there is no side effect such that the cylindrical end of the metering member is disengaged from the surface of the ink applicator roller, thereby causing undesired widening of the gap. Only when using highly viscous printing inks is it desirable to pivot at as large an angle as possible in order to achieve free flow of the ink. In contrast to the known metering elements, the metering element constructed according to the invention can indeed pivot with respect to the inking roller over an angle of approximately ± 90 ° from a standard radial orientation. Since the measuring member of the present invention can be pivoted in a large angle range, a relatively large frictional action is caused by the oscillating movement of the measuring member. Evenly distributed to. The recess following the cylindrical end of the metering member according to the invention is the part through which the scraped ink serves as a guide for the ink, from this cylindrical end in the recess to the recess, and subsequently of the metering member. It acts so as to be able to flow back to the ink container via the. Since the recess follows the cylindrical shaping end, it likewise acts on the desired large pivot range of the metering element. The structural advantages of the present invention are further enhanced by the wear resistant implementation of the cylindrical end of the metering member. This is because, for example, it is possible to abandon the coating of the cylindrical end portion with a wear-resistant foil sheet. More specifically,
A sheet-covered scale-out member of this type would have a complex structure to provide the structurally limited advantages of the present invention.

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 recesses arranged on both sides is preferably formed continuously. That is, the cylindrical imprinting end extends into the recessed portion or groove rounded by the tangential extension, and the groove moves again to the continuous portion of the measuring member. However, it is advisable that it be drained so that it can be supplemented for collection in this area.

In the present invention, the measuring member may be constructed as a partial piece, or at least a cylindrical shaping end portion,
Consisting of a multi-piece part which is arranged in a pivotable cage (which part projects into the cage from the cylindrical shaping end) and in which a recess is provided, which in a suitable manner They may be fixedly coupled 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. This advantage of a partial piece is particularly effective in a multi-page width measuring member such as used in so-called panoramic printing.

The shape of the invention of the metering member in the area of contact with the inking roller and in the area protruding with the recesses arranged on both sides in the pivot retainer has the shape of the invention of die grinding, milling, spark discharge corrosion, It can be produced by any other suitable 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 portion is continuous with the recesses 14 formed on both sides of the measuring member and running in the axial direction. The recess 14 has a substantially V-shape, and the cylindrically shaped portion 13 is adapted to be transferred to the recess 14 on both sides in a substantially tangential extension. The narrowest part of the measuring member 12 defined by the recesses 14 on both sides is rounded to promote 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 at least 180 °, and this cylindrical shaping on both sides of the scale-out member. As a result of the construction with the recess 14 linked to the end 13, it is possible to 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 of the measuring member 12 can extend to almost ± 90 ° with respect to the standard position without undesirably compromising 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 having a cylindrical shaping end portion which covers an angle range of 180 ° or more and is continuous with concave portions 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: Recessed portion

Front Page Continuation (72) Inventor Peter Gerch, Hartenegg Wake, Niederschelli, Switzerland 6 (72) Inventor Robert Imhof, Birkenweg, Bern, Switzerland 23

Claims (8)

[Claims] 1. A scale-out member for a printing press inking device such as a scraper blade or a doctor, which is (a) fixed in a pivot cage and (b) has a radius (R) in the range of 0.3 to 1.5 mm. A cylindrical shaped end 13 having
In the case where the cylindrical imprint end (13) is pressed by the ink application roller (6) to form a measuring gap for the ink to be measured, (d) the cylindrical imprint end (13) is 180 °.
Covering a larger angle range, (e) the cylindrical shaping end is connected to axially extending recesses (14) formed on both sides of the measuring member, and (f) the cylindrical shaping end. Department (1
A measuring member characterized in that 3) is configured to have wear resistance. 2. The weighing element according to claim 1, wherein the angular range W lies between 200 ° and 280 °, in particular about 250 °. 3. The measuring member according to claim 1, wherein a transition portion between the cylindrical shaping end portion (13) and the recess (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-piece piece of 5) and a portion where a recess is provided, and these piece pieces are fixedly coupled to each other. 6. The measuring member according to claim 1, wherein the cylindrical shaping end portion (13) is made of wear-resistant ceramic, sintered metal or synthetic material. 7. The measuring member according to claim 1, wherein the cylindrical shaping end portion (13) has a wear resistant surface. 8. The scale-out member according to claim 7, wherein the wear resistance is formed by a vapor-deposited metal layer.