FR2480186A1 - SYSTEM FOR REMOTELY ADJUSTING THE INK MECHANISM OF PRINTING MACHINES IN POLYCHROMY - Google Patents

Abstract

A. WE PROPOSE A SYSTEM FOR REMOTE ADJUSTMENT OF THE INKING MECHANISM OF PRINTING MACHINES IN SEVERAL COLORS, IN PARTICULAR ON SHEETS; B. INKWELL 1 AND INK CYLINDER 3 ARE RIGID AT BENDING AND A SQUEEGEE 2 OF A SINGLE PIECE ON WHICH SUPPORT ELEMENTS 5 CONNECTED WITH STEP-BY-STEP MOTORS ACT, CONSTITUTING THE ADJUSTMENT ELEMENTS 6, REMOTE CONTROLS; C. THIS SYSTEM ENSURES A VERY GOOD INK ADJUSTMENT, PERFECTLY REPRODUCIBLE.

Description

The invention relates to a system for remote adjustment of the mechanism

  inking of polychrome printing machines, in particular sheet-fed printing machines

in polychromy.

  Remote control systems are already known for the inking mechanism of rotary printing machines in polychrome, which consists of an inkwell comprising an ink cylinder and a doctor blade and support elements of the

  remotely operated doctor blade, acting on the latter.

  We can not get with this system designed for

  rotary printing machines, different color

  satisfied with the high quality requirements

  that we put to the products of sheet printing.

  Already known from patent DE 2 714 577 by

  for example, remote control systems of the drive mechanism

  crushing multi-colored sheet printing machines that give up uniform squeegees, and

  color and similar elements forming the doctor blade.

  The disadvantage here is that these elements are highly susceptible to soil and that consequently it is in practice not possible, because of collages and jamming, to obtain with these systems a precise adjustment,

  reproducible colorations. This setting is imprecise and

  reproducible is further dé in the fact that the control members used and their control are inappropriate. In addition, the duration of the adjustment is relatively important and the set of

  the installation represents a high economic burden.

  The object of the invention is to bring the adjustment of the coloring to an optimum point on polychrome printing machines, without great technical expense with a large and

sustainable operation.

  For this purpose, the invention proposes to carry out

  an adjustment system of the inking mechanism based on the use

  an undivided common squeegee, with great stability of the system, by controlling extreme color profiles and ensuring an exact reproducible adjustment of the setting

coloring.

  This result is obtained.according to the invention.the fact that the inkwell and the ink cylinder which cooperates with it are made rigid flexion, it is added to the inkwell

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  a one-piece skirting, on which support elements act, connected with deflected adjustment elements, and arranged near the edge of the doctor blade, the adjustment elements adjoined to each anchoring zone being made under the form of stepper motors individually controlled by a control network, following the principle of control in a similar electrical state before and after the execution of a step, and position indicators detecting the position of the motors not to not individually, and in that it is

  assistant to the control network, a calculator ensuring the

  because of the inconstant curve of the position of the elements of

  squeegee support with the constant function of the

  of the bending of the squeegee when prescribed limit values for discontinuity points of the adjoining and connecting adjustment element positions are exceeded

on both sides.

  The invention will be better understood with regard to the

  description below and the attached single figure representing

an exemplary embodiment.

  -This unique figure represents the system of

  remote adjustment of the inking mechanism according to the invention.

  The remote adjustment system of the inking mechanism consists of an ink fountain 1 with a one-piece doctor blade 2 and an inking cylinder 3. The ink fountain 1 and the ink roll 3 are here extremely rigid and resistant to bending so that no movement occurs which would distort the adjustment values due to bending or twisting. Support elements act on rAcle 2 in the vicinity of its cutting edge. These support elements of the doctor blade advantageously consist of levers systems 5 on which the adjusting elements 6 of the coloring zones 11 by means of screws 11 act. These elements are placed below the doctor blade, in places where they not soiled, and are protected from soiling by additional accessories such as sheets or sheets forming drip-trays. The support elements of the doctor blade can not

not sticking or getting stuck.

  The adjustment elements 6 are made in the form of stepper motors, these motors being in the same electrical state before and after taking a step,

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  to simplify the control effort. The control of the stepper motors is carried out by means of a control network 4. The stepper motors contain position indicators 12 made in the form of potentiometers which reflect the position of these motors. The use of stepper motors with the described type of control ensures that the setting of the squeegee support elements will be exactly reproducible and also guarantees, the accuracy of the repetition of the position of the motors not to

  not. The control network 4 is directed by a telecommunication console.

  mande 7 which contains driving elements 8 and elements

  indicators 9 for each coloring screw.

  It is attached to the control network a calculator 10 which compensates for the constant curve of the position of the support elements of the doctor blade with the constant function of the bending curve of the rake when exceeded limit values prescribed for points of discontinuity of positions of adjacent adjusters

and connecting on both sides.

  It is thus possible, without knowing the function of the bending characteristic line of the rake, to prevent a squeegee 2 from following the adjustment elements.

during the operation.

  The combination of the characteristics mentioned

  conditioning and complementing each other ensures in a remarkable way

  it is possible to obtain an optimum system for the remote adjustment of the inking mechanism, which makes it possible to use it even for quality impressions of the doctor blade in one piece which is not considered as being usable in the literature, and who makes a system that can be made economically

  which effectively meets all the requirements in practice

asked questions.

2 48 0 1 8 6

Claims (1)

CLAIM   Remote control system of the drive mechanism   a plurality of printing machines in several colors comprising an ink fountain, containing setting elements driven by motors controlled from a remote control panel, associated with the squeegee of the inkwell, characterized in that the ink fountain ( 1) and the inking cylinder (3) which cooperates with it are made rigid flexion, it is added to the ink (1) a squeegee (2) in one piece, on which act support elements , connected with soil-protected adjusting elements (6) and arranged near the cutting edge of the doctor blade (2), the adjusting elements (6) associated with each inking zone being in the form of motors   step by step, individually controlled by a network (4) of   mande, following the principle of the command in a similar electrical state before and after the execution of a step, and position indicators (12) detecting the position of the stepper motors individually, and in that it is assistant to the command network   (4) a calculator (10) for comparing the inconsistent layer   the position of the squeegee support elements with the constant function of the characteristic of the squeegee bending when prescribed limit values are exceeded for points of discontinuity of the setting element positions   adjacent and connecting on both sides.