DD275992A3 - RAKELMESSERHALTER WITH SELF-TIMING RAKEL PRESSURE COMPENSATION - Google Patents

Abstract

The invention relates to a doctor blade holder with selbsttaetigem squeegee pressure compensation, especially for gravure printing machines, such that the basic body has two center bearing bolts which are mounted by a predetermined distance in a perpendicular to the Abrakelvorrichtung sliding groove of the two blade jaws, wherein the squeegee is arranged rotatably and vertically displaceable and on the opposite side of the grooved Grundkoerpers spring elements are arranged on both sides of the bearing pin. As a result, with little effort a clean doctoring off of the plate with the lowest squeegee and cliché wear is guaranteed, during the Abrakelvorganges at each point of the line of contact between doctor blade and cliché surface of the contact between doctor and cliché is guaranteed at the lowest Rakeldruecken.

Description

For this 1 page drawing

Field of application of the invention

The invention relates to a doctor blade holder with automatic squeegee pressure compensation, especially for Tiefdrijckmaschinen with a connected to the printing unit of the machine body and actuators, wherein the basic body in einor groove has a two squeegee jaws rotatable and vertically displaceable doctor.

Characteristic of the known state of the art From the Stanü of technology, several variants are known, the problem of automatic squeegee pressure compensation over the

Whole doctor blade length during Abrakelvorganges the object.

According to DRP 703738 a squeegee device is known in which the Ratal is centered in a point so that the same during

the Abrakelvorganges by commuting around the bearing point necessary for the production of a contour-fresh doctor blade image

Parallelism between the doctor blade and cylinder surface when placed on the forme cylinder itself realized. The disadvantage here is that the doctor during Jodes Druckzyklusses after lifting from the Formzylinderoberlläche

so far can adjust, that with a constant restarting a uneven blade cutting wear the consequence

In addition, in this case, the squeegee pressure introduced in the pivot point of the doctor blade is to be assessed as unfavorable, as a gentle Positioning of the doctor blade on the surface of the cliché can only be guaranteed to an insufficient degree. According to DE-OS 2435321 a device for adjusting the ink blade is described on printing machines. This device is made for the purpose of glelchn Säßlgen doctor blade support on the surface of the printing cylinder of several Adjusting rods for adjusting the doctor blade. These are next to each other in series on the front edge dos Farbmessers

attached. Each of these adjustment rods is connected to one adjusting screw, which are screwed in a reinforcing strip as a support part of the doctor mechanism. With the immersion depth of the Stellschrr ob? In the bearer roll can zweisweisu the

Contact pressure of the squeegee can be varied on the squeegee cylinder. Furthermore, according to DEO ^ 2302728 oine screen printing device is known, the au¬ similar type, the variation of the contact pressure of Squeegee allows. Hi'.ryu r'md along the doctor blade spring arrangements provided such that by means of an adjustable sleeve of the Spring pressure opposite: '.bin fixed Doctor blade mounted in the machine frame can be adjusted. The doctor carrier is by means of Spigots slidably mounted in the sleeves and supported by springs. The inventions described are relatively expensive solutions for the adjustment of the doctor used

automatic compensation of the doctor blade to the impression cylinder does not take place. In addition, the replacement of the squeegee turns out to be problematic because the Einstellmechanlsmon need to be attached to the squeegee, which can be very time consuming with large squeegee lengths.

Such devices alnd further known from DE-PS 2938455 and DE-PS 3025980, which also offered several) on the Doctor blade length distributed plunger mechanisms are arranged, over which the doctor blade can be adjusted in zones. It

However, was waived a cohesive connection between plunger and blade and thus a simpler change of

Squeegee allows. The application of these inventions oriented, apart from the possibility <! ·. ?? manual adjustment

the fact that after optical Beurtoilung dos print image the olnzelnen Verstellstößel electromotorically, such

Pressure conditions of the squeegee on the printing cylinder schoffon that diosor eouber abgerakelt word «, η can. The advance mechanism Is by necessary Erkennunyssysteme and the Einzolantriebos each plunger very complli lert and only for Bodruckungsautomaten certain process techniques economically favorable. The use of smaller sizes, for example, as used in the Far bümdrucktechnikk, is therefore

The realization of the latter solutions is unsuitable and economically unacceptable.

Object of the invention

The aim of the invention is to offer a solution which, applied in the gravure printing technique, guarantees a clean scraping of the cliché with the lowest possible doctor blade and cliché wear.

Explanation of the essence of the invention Object of the invention It is to provide a Rakelmeeserhaltor, during the Abrakelvorgangs in each point of the Contact line between squeegee blade and cliché surface ensures contact between squeegee and cliche, wherein

to work with the lowest squeegee pressure.

According to the invention, this object is achieved by the features specified in the claims. The doctor blade holder then consists of a grooved body and actuators, the body directly with

is connected to the printing unit of the printing press. He has in one of the cliché surface facing groove one between two

Squeegee fixed on squeegee. In the unloaded condition, d. H. with rake not pressed on the cliché |, two in the direction of squeegee prevent the Body penetrating bearing pin falling out and lateral displacement of the squeegee clamping by these in

in each case immerse a sliding groove running perpendicular to the surface of the cliché in each of the two squeegee clamping jaws.

Corresponding spring elements exert pressure on the blade clamping on both sides of the bearing pin, whereby the two Slide the bearing pin into the sliding groove of the two squeegee clamping jaws as far as the groove end, thus providing the widest possible extension of the Narrow blade tensioner or the squeegee from the body limit. The thus clamped doctor blade can therefore not only a pendulum motion to the cliché when placed on the cliché Perform bearing pin, but also in overcoming the spring pressure of both spring elements of the cliché surface

be lifted off. By changing the bias of the spring elements thus the squeegee pressure can be set to dos cliche any and appropriate.

The invention provides a solution which is used in gravure printing, with little effort and

simple technical means a clean scraping of the cliché with lowest squeegee and cliché wear guaranteed.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing shows:

1 shows an overall view of the doctor blade holder.

In a connected to the printing unit of the printing press base body 10, which corresponds in its length in about the doctor blade 1 used, a deep groove 11 is incorporated at right angles to the squeegee direction, which between two blade jaws 2a; 2 b firmly fixed squeegee 1 absorbs. Two bearing bolts 4 which penetrate the base body 10 in alignment and are located in the latter dip into one, one blade clamping jaw 2 a; 2 b located Gleitnut 3, which extend perpendicular to the Abrakelrichtung.

Since these Gleitnuten 3 are not continuous in the embodiment, but in the upper region of the blade clamping jaws 2 a; 2 b ends, in the unloaded state, the doctor blade 2 together with the blade clamping jaws 2 a; 2 b mounted pendulum about the two bearing pin 4. On the groove 11 opposite surface of the body 10 are arranged symmetrically, two! Actuators for adjusting the squeegee pressure during the Abrakelvorganges. The actuators are im'einzelnen so constructed that in a Gowindeplatte 12 a pierced screw 7 is screwed, whereby by screwing it into the threaded plate 12, a spring element 6, which is located under the screw 7, is tensioned. The abutment 7a located on the plunger 6 and on the adjusting screw 7; 7 b are used in limiting the F ederweges of the spring element 5. This spring element 5 pushes the guided in the bore of the screw 7 and the main body 10 ram 6 against both blade clamping jaws 2 a; 2b, whereby the Nutenden the Gleitnuten 3 are pressed against both bearing pin 4 and thus a movement of the doctor blade 1 in the direction of groove bottom of the groove 11 can be made only by overcoming the preset spring forces. The basic body 10 and the screws 7 penetrating plunger 6 are provided with a plunger head 8, with the help of us is possible to mutually raise the plunger β, which guarantees that the blade clamping jaws 2a; 2b can be pulled laterally out of the groove 11 with the doctor blade 1 after lifting the slide groove 3 from the bearing pin 4. To ensure this possibility for snowy and easy change of the doctor blade 11 is a distance 13 of the sliding groove 3 is less than a distance 9 dor groove 11th

The installation of the between the doctor blade clamping jaws 2 a; 2 b pre-doctored doctor blade 1 can likewise be carried out in a straightforward manner analogously to the removal and in the reverse order after the realization of the abovementioned conditions, the interlinked doctor blade laser beams 2 a; 2 b and the clamped between these doctor blade 1 after wechsolseltlgon lifting the plunger β are inserted into the groove 11.

Claims (3)

1. Doctor blade holder with automatic squeegee pressure compensation, insbesondei e for gravure printing machines with one connected to the printing unit of the machine body and provided with spring elements actuators, the main body in a groove between two squeegee jaws rotatable and vertically displaceable doctor has, characterized in that the main body ( 10) has in the center two bearing bolts (4), which are mounted at a predetermined distance in a direction perpendicular to the Abrakelrichtung Gleitnut (3) of the two blade clamping jaws (2 a, 2 b), and that on the opposite side of the with a groove (11 ) provided basic body (10) the spring elements (5) on both sides of the bearing bolts (4) are arranged. 2. Doctor blade holder according to claim 1, characterized in that the actuators, consisting of a plunger head (8), a plunger (6), an adjusting screw (7) with abutments (7 a, 7 b) and the spring element (5) perpendicular to the blade clamping jaws (2a, 2b) are arranged. 3. Doctor blade holder according to claim ^, characterized in that a distance (13) of the sliding groove (3) is less than a distance (9) of the groove (11).