DE102018132125A1 - Method for determining a diameter or radius of a printing cylinder of a printing press - Google Patents

Abstract

The present invention has for its object to provide a novel method for determining a diameter or radius of a printing cylinder of a printing press. The solution is provided by the following steps: Transferring the printing unit in a print-off position by increasing the distance X between printing cylinders of the printing unit ; Arranging a sleeve body on the base body of at least one printing unit cylinder, so that in each case a sleeve body is arranged on the main bodies of the two cooperating printing cylinder of the printing unit, and determining the integer ratio n of the diameter of the first cylinder to the second cylinder; Transferring the printing unit in the direction of a print-on position by reducing the distance X between the printing unit cylinders of the printing unit and thereby rotating driving only a printing unit cylinder of the printing unit; Monitoring the displacement path ΔX or the changing distance X between the printing couple cylinders and monitoring the non-rotationally driven printing couple cylinder for rotational movement; Determining the distance X2 between the printing couple cylinders at which the non-rotationally driven printing couple cylinder starts to rotate; Determining the diameter or the radius of the second printing cylinder and / or determining the diameter or the radius of the first printing cylinder (Fig. 2).

Description

The invention relates to a method for determining a diameter or radius of at least one printing unit cylinder of a printing press.

Printing units of an offset printing press have printing cylinder, namely a forme cylinder and a transfer cylinder, via an inking unit and preferably via a dampening unit. On the form cylinder of such a printing unit at least one printing form is positioned, which may be formed as a printing plate, which is why forme cylinders are also referred to as a plate cylinder. On the transfer cylinder of such a printing unit at least one transfer mold is positioned, which may be formed as a blanket, which is why transfer cylinders are also referred to as rubber cylinders.

The inking unit of such a printing unit is used for the application of printing ink and the optionally existing dampening unit of such a printing unit the application of dampening solution to the or each positioned on the form cylinder printing form. Starting from the or each printing form positioned on the forme cylinder, the printing ink is transferred via the or each transfer mold positioned on the transfer cylinder to a printing material to be printed, whereby the printing material to be printed is moved through a printing gap positioned between the transfer cylinder and an impression cylinder. The counter-pressure cylinder may be a satellite cylinder or else a transfer cylinder of another printing unit.

To provide format-variable printing presses, printing units are known, whose forme cylinder and transfer cylinder each have a base body and a printing unit of the printing unit determining, arranged on the body sleeve body. For the operation of the printing press, it is necessary to know the diameter or radius of the respective printing cylinder. For this purpose, it has hitherto been necessary for an operator to manually enter the diameter or radius of the respective sleeve body on a control unit. Incorrect entries can cause incorrect operation of the press. There is a need to avoid such incorrect inputs or incorrect operation.

In printing presses with a forme cylinder and a transfer cylinder such as an offset printing press the circumferences and thus the diameters or radii of the forme cylinder and the transfer cylinder are not arbitrarily variable to each other, but to ensure a trouble-free pressure transfer, the diameter or the radius of the transfer cylinder is preferably an integer Multiple of the diameter of the forme cylinder. The quotient of the diameter of the transfer cylinder to the diameter of the forme cylinder is referred to below as the diameter ratio n.

In most cases, the sleeve diameter or the sleeve radius of the sleeve body arranged on the base bodies of a first printing cylinder and a second printing cylinder are identical, in this case the diameter ratio n is equal to one. It is also common to carry out the transfer cylinder with a double circumference and thus a double diameter or radius as the forme cylinder; in this case, the diameter ratio n is equal to two, whereby odd fractions of the diameter ratio are not excluded.

An operator is thus known due to the specification of the printing press and / or the sleeve body used, with which diameter ratio the printing press is to be operated, although the operator due to the partially relatively fine gradation of the diameter of the printing cylinder or rather the sleeve body of the exact diameter of the printing cylinder or rather the sleeve body is not known.

On this basis, the present invention has the object to provide a novel method for determining a diameter or radius of a printing cylinder of a printing press.

This object is achieved by a method for determining a diameter or radius of a printing cylinder of a printing press according to claim 1. The method comprises at least the following steps:

Method for determining a diameter d _11B . d _12B or a radius ( _11B . r _12B at least one printing cylinder of a printing unit of a printing press, wherein the respective printing cylinder has a base body and a pressure format of the printing unit determining, arranged on the body sleeve body, with at least the following steps: Transferring the printing unit in a print-off position by increasing the distance X between printing cylinders of the printing unit; Arranging a sleeve body on the base body of at least one printing unit cylinder, so that in each case a sleeve body is arranged on the main bodies of the two cooperating printing cylinder of the printing unit, and determining the integer ratio n of the diameter of the first cylinder to the second Cylinder; Transfer the printing unit towards a print on position by reducing the distance X between the printing couple cylinders of the printing unit and in this case rotating driving only a printing unit cylinder of the printing unit; Monitoring the relocation path .DELTA.X or the changing distance X between the printing cylinder and monitoring the non-rotating driven printing cylinder to a rotary motion; Determining the distance X2 between the printing couple cylinders, at which the non-rotationally driven printing cylinder starts to rotate; Determine the diameter d _12B or the radius r _12B of the second printing cylinder and / or determining the diameter d _11B or the radius _11B of the first printing cylinder.

The invention allows an automatic determination of the diameter or the radius of at least one printing cylinder of a printing unit of a printing press.

According to an alternative development, the distance between the printing cylinder, in which the non-rotatably driven printing unit cylinder begins to rotate, by detecting the distance X2 certainly.

In a further alternative development, the distance between the printing cylinder, in which the non-rotatably driven printing unit cylinder begins to rotate, determined in the form that the distance X1 is determined between the cylinders in the pressure-off position and the distance X1 a traversed displacement path at which the non-rotationally driven printing cylinder begins to rotate is subtracted.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below.

• 1: eine stark schematisierte Darstellung von zwei Druckwerkzylindern in Druck-Ab-Stellung; und
• 2: eine stark schematisierte Darstellung der zwei Druckwerkzylinder in Druck-An-Stellung.

Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

• 1 : a highly schematic representation of two printing cylinders in print-off position; and
• 2 : A highly schematic representation of the two printing cylinder in print-on position.

The invention relates to a method for determining a diameter or a radius of a printing cylinder 11 . 12 a printing press.

1 and 2 show very schematically a section of a printing unit 10 a printing press in the range of two printing cylinders 11 . 12 , At the first printing cylinder 11 it can be a transfer cylinder and the second printing cylinder 12 to act a form cylinder.

1 shows the two printing cylinder 11 . 12 of the printing unit 10 in a pressure-off position, in which a distance X1 between centers or axes of rotation of the printing cylinder 11 . 12 is enlarged. 2 shows the two printing cylinder 11 . 12 in a pressure-on position at a reduced distance X2 between the centers or axes of rotation thereof.

In the illustrated embodiment, each of the two printing cylinder 11 . 12 over a first and second body 11A . 12A and one on each of the first and second bases 11A . 12A positioned, a print format of the print engine 10 determining first and second sleeve body 11B . 12B , The basic body 11A . 12A are also referred to as spines and have a fixed diameter d _11A or. d _12A , As already stated, the respective sleeve body is used 11B . 12B who is on the respective main body 11A . 12A is arranged, the adaptation of the print format. Depending on the print format, sleeve bodies can 11B . 12B with very different diameters d _11B or. d _12B be used.

For printing presses with a first printing cylinder 11 and a second printing cylinder 12 such as an offset printing machine, the circumferences and thus the diameters and radii of the first and second printing cylinder 11 . 12 not arbitrarily variable with each other, but to ensure a trouble-free pressure transmission is the diameter or the radius of the first printing cylinder 11 a multiple, preferably an integer multiple, the diameter or the radius of the second printing cylinder 12 , The quotient of the diameter of the transfer cylinder to the diameter of the forme cylinder is referred to below as the diameter ratio n.

• r_11B = n × r_12B und somit n = r_11B / r_12B beziehungsweise
• d_11B = n × d_12B und somit n = d_11B / d_12B
• sowie d_11B = 2 × r_11B und d_12B = 2 × r_12B

Thus, the following relationship between the diameters applies d _11B . d _12B or radii _11B . r _12B the first and second printing cylinder 11 . 12 :

• r _11B = n × r _12B and thus n = r _11B / r _12B respectively
• d _11B = n × d _12B and thus n = d _11B / d _12B
• and d _11B = 2 × r _11B and d _12B = 2 × r _12B

In most cases, the sleeve diameter d _11B . d _12B or the sleeve radius _11B . r _12B the on the bodies of a first printing cylinder 11 and a second printing cylinder 12 arranged sleeve body 11B . 12B identical, in this case, the diameter ratio n is equal to one. In this case: $${\text{<figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}={\text{<figure-callout id="12B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{12B}}$$

It is also common for the transfer cylinder 11 with a double circumference and thus a double diameter d _11B or radius _11B like the form cylinder 12 run; in this case, the diameter ratio n is equal to two, whereby odd fractions of the diameter ratio n are not excluded.

Proper control of the printing operation requires the diameter d _11B . d _12B the printing cylinder 11 . 12 that by the diameter d _11B . d _12B the sleeve body 11B . 12B is determined to know. The invention now relates to a method by means of which at least one diameter d _11B . d _12B at least one printing cylinder 11 . 12 can be detected automatically.

In the course of the process according to the invention is a printing unit 10 , in the area of the diameter or radius of at least one printing cylinder 11 . 12 is to be determined, transferred to a pressure-off position, in a pressure-off position according to 1 in which the distance X1 between the printing cylinders 11 . 12 is enlarged. If necessary, this distance X1 between the first impression cylinder 11 and the second impression cylinder 12 detected in the pressure-off position. The detection of the distance X1 can either by moving the two printing cylinder 11 . 12 to fixed positions with a defined distance X1 it is also possible to determine the distance between the two printing cylinder in a known manner, for example by measuring the positions of the printing cylinder 11 . 12 to each other.

Subsequently, in the embodiment of 1 and 2 on the body 11A . 12A of at least one printing cylinder 11 . 12 , preferably on the basic bodies 11A . 12A of two cooperating printing cylinders 11 . 12 of the printing unit 10 one sleeve body each 11B . 12B arranged. Usually only a sleeve body 11B . 12B , swapped if the other sleeve body 11B . 12B on the respective other printing cylinder 11 . 12 remains. To work reliably before determining the diameter d _11B . d _12B or radii _11B . r _12B on every printing cylinder 11 . 12 in each case an associated sleeve body 11B . 12B be arranged. Here, however, the required or desired diameter ratio n of the diameter d _11B of the first printing cylinder 11 to the diameter d _12B of the second printing cylinder 12 Optionally, this diameter ratio n can also be stored as a fixed value for the calculation.

Subsequently, the respective printing unit 10 transferred to a pressure-on position, namely by reducing the distance X around the relocation route .DELTA.X between the two printing cylinders 11 . 12 in the position of 2 ,

At this reduction of the distance X between the printing cylinders 11 . 12 That is, during the transfer of the printing unit 10 from the print-off position toward the print-on position, becomes one of the printing cylinder 11 . 12 driven in rotation, the other printing cylinder 12 . 11 is not driven in rotation.

When transferring the respective printing cylinder 11 . 12 , of the printing unit 10 from the pressure-off position toward the pressure-on position becomes the displacement path .DELTA.X or the changing distance X between the printing cylinders 11 . 12 supervised. On the other hand, it is monitored whether the non-rotating driven printing cylinder 11 . 12 starts to turn.

Then, when the non-rotating driven printing cylinder 12 . 11 of the printing unit 10 starts turning, becomes the current displacement path .DELTA.X or current distance X between the printing cylinders 11 . 12 determined, in which case the diameter or the radius of at least one of the printing cylinder 11 . 12 depending on the distance X2 automatically determined.

The distance X2 in which the non-driven printing cylinder 11 . 12 it starts to spin and can be determined in different ways.

For one, it is possible the distance X2 metrologically, either by measuring this distance or by determining the two current positions of the two printing cylinder 11 . 12 , This can be done in the case of adjustment by means of a threaded spindle, for example via the retroactive calculation of the respective adjustment by means of a rotary encoder.

The distance X2 but can also be determined in the form that the distance X1 the two printing cylinder 11 . 12 is determined in the pressure-off position and that of this distance X1 the recorded relocation path .DELTA.X is subtracted. Will both printing cylinders 11 . 12 moved, so is the relocation path .DELTA.X the sum of the respective adjustment paths of the individual printing cylinder 11 . 12 , In this variant, both the distance X1 as well as the relocation route .DELTA.X to investigate.

Subsequently, the diameter of the first and / or the second printing cylinder 11 . 12 certainly.

Here, the following facts are used as a basis: $$\text{X}2={\text{<figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}+{\text{<figure-callout id="12B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{12B}}$$

Due to the known diameter ratio n, the two cylinder diameters or cylinder radii can be related, in this case: $${\text{<figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}=\text{n}*{\text{<figure-callout id="12B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{12B}}$$

respectively $${\text{r}}_{\text{12B}}={\text{<figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}\text{/ n}$$

• X2 = r_12B + (n * r_12B) und somit X2 = r_12B * (n + 1)
• Aufgelöst nach dem Radius ergibt dies: r_12B = X2 / (n + 1)
• Für die Berechnung des Durchmessers d_12B gilt: d_12B = 2 * r_12B

If Equation 2 is used in Equation 1, it follows that

• X2 = _r12B + (n * _r12B ) and thus X2 = _r12B * (n + 1)
• Resolved by the radius this yields: r _12B = X2 / (n + 1)
• For the calculation of the diameter d _12B : d _12B = 2 * r _12B

• X2 = (r_11B / n) + r_11B und somit X2 = r_11B * (1 + 1/n)
• Aufgelöst nach dem Radius ergibt dies: r_11B = X2 / (1 + 1/n)
• Für die Berechnung des Durchmessers d_11B gilt: d_11B = 2 * r_11B

If Equation 3 is used in Equation 1, it follows:

• X2 = (r _11B / n) + r _11B and thus X2 = r _11B * (1 + 1 / n)
• Resolved by the radius this gives: r _11B = X2 / (1 + 1 / n)
• For the calculation of the diameter d _11B : d _11B = 2 * r _11B

wobei r_11B und r_12B die Radien der Druckwerkzylinder 11, 12 sind, und wobei X2 derjenige Abstand zwischen den Druckwerkzylindern 11, 12 ist, zu welchem sich der der nicht drehend angetriebene Druckwerkzylinder des Druckwerks 10 anfängt zu drehen.Then, if like in 1 and 2 shown on the main bodies 11A . 12A both printing cylinder 11 . 12 sleeve body 11B . 12B are arranged with an identical sleeve diameter or sleeve radius, the diameter or radius of both printing cylinder 11 . 12 certainly. In particular: $${\text{<figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}={\text{<figure-callout id="12B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{12B}}=\text{X2 /}\left(1+1\right)=0.5*\text{X}2$$

in which _11B and r _12B the radii of the printing cylinder 11 . 12 are, and where X2 the distance between the printing cylinders 11 . 12 is, to which the non-rotating driven printing cylinder of the printing unit 10 starts to turn.

wobei r_12B der zu bestimmende Radius des zweiten Druckwerkzylinders 12 ist, wobei r_11B der bekannte Radius des ersten Druckwerkzylinders 11 ist, und wobei X2 derjenige Abstand zwischen den Druckwerkzylindern 11, 12 ist, zu welchem sich der der nicht drehend angetriebene Druckwerkzylinder des Druckwerks 10 anfängt zu drehen.In an alternative of the invention, it is possible that the diameter or the radius of a first printing cylinder 11 is known and predetermined, and the diameter or radius of the second printing cylinder 12 automatically determined by the method. In this alternative applies in particular: $${\text{<figure-callout id="12B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{12B}}=\text{X2}-{\text{<figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}{\text{or <figure-callout id="11B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{11B}}=\text{X2}-{\text{<figure-callout id="12B" label="r" filenames="DE102018132125A1\_0007.png" state="{{state}}">r</figure-callout>}}_{\text{12B}}$$

in which r _12B the radius of the second printing cylinder to be determined 12 is, where _11B the known radius of the first printing cylinder 11 is, and where X2 the distance between the printing cylinders 11 . 12 is, to which the non-rotating driven printing cylinder of the printing unit 10 starts to turn.

It is possible that on the sleeve body 12A a printing cylinder designed as a forme cylinder 12 at least one printing plate is or is arranged, in particular at least one printing plate.

On the sleeve body 11B a printing cylinder designed as a transfer cylinder 11 can be arranged at least one transfer form or be, so for example, designed as a blanket or blanket transfer form.

The transfer of the printing cylinder 11 . 12 from the pressure-off position toward the pressure-on position can be continuous or stepwise.

As already stated, only one of the printing cylinder 11 . 12 driven in rotation. Once a contact of the rotating driven printing cylinder 11 . 12 to the adjacent, not rotationally driven printing cylinder 12 . 11 exists, the non-rotating gearbox printing cylinder begins 12 . 11 to rotate. With the beginning of the rotation of the non-rotating driven printing cylinder and the achieved distance X2 between the printing cylinders 11 . 12 can the diameter d _11B . d _12B or the radius _11B . r _12B at least one of the printing cylinder 11 . 12 be determined automatically. If necessary, rotational speeds can be taken into account.

It is possible to determine the diameter of a forme cylinder and / or the diameter of a transfer cylinder of a preferably designed as an offset printing unit printing unit in the manner described above. In this case, the form cylinder or alternatively the transfer cylinder can be driven in rotation and monitored when the non-rotatably driven transfer cylinder or alternatively the non-rotatably driven form cylinder begins to rotate. It is also possible to rotationally drive an impression cylinder of the printing unit in order to determine the radius or diameter of an adjacent transfer cylinder.

LIST OF REFERENCE NUMBERS

10

printing unit

11

Printing cylinder, transfer cylinder

11A

body

11B

sleeve body

12

Printing cylinder, form cylinder

12A

body

12B

sleeve body

d _11B

Printing cylinder diameter

d _12B

Printing cylinder diameter

_11B

Printing cylinder radius

r _12B

Printing cylinder radius

X1

Printing unit cylinder distance in pressure-off position

X2

Printing unit cylinder spacing in print on position

X

Printing cylinder spacing

.DELTA.X

displacement path

N

Diameter ratio

Claims (11)

Method for determining a diameter (d _11B , d _12B ) or a radius (r _11B , r _12B ) of at least one printing unit cylinder (11, 12) of a printing unit (10) of a printing press, wherein the respective printing group cylinder (11, 12) has a base body (11 11A, 12A) and a printing unit of the printing unit (10) determining, on the base body (11A, 12A) arranged sleeve body (11B, 12B), comprising at least the following steps: transferring the printing unit (10) in a print-off position by increasing the distance X between printing cylinders (11, 12) of the printing unit (10); Arranging a sleeve body (11B, 12B) on the base body (11A, 12A) of at least one printing unit cylinder (11, 12) so that on the main bodies (11A, 12A) of the two cooperating printing cylinder (11, 12) of the printing unit (10) respectively a sleeve body (11B, 12B) is arranged, and determining the integer ratio n of the diameter of the first cylinder (11) to the second cylinder (12); Transfer of the printing unit (10) in the direction of a print-on position by reducing the distance X between the printing cylinders (11, 12) of the printing unit (10) and thereby driving only one printing unit cylinder (11, 12) of the printing unit (10) ; Monitoring the displacement path ΔX or the changing distance X between the printing couple cylinders (11, 12) and monitoring the non-rotationally driven printing couple cylinder (12, 11) for rotational movement; Determining the distance X2 between the printing couple cylinders (11, 12) at which the non-rotationally driven printing couple cylinder starts to rotate; Determining the diameter d _12B or the radius r _{12B of} the second printing cylinder (12) and / or determining the diameter d _11B or the radius r _{11B of} the first printing cylinder (11). Method according to Claim 1 , characterized in that the diameter d _12B or the radius r _{12B of} the second printing cylinder (12) according to the formula r _12B = X2 / (n + 1) or d _12B = 2 * (X2 / (n + 1) and / or Determining the diameter d _11B or the radius r _{11B of} the first printing cylinder (11) according to the formula r _11B = X2 / (1 + 1 / n) or d _11B = 2 × (X2 / (1 + 1 / n)) is determined , Method according to one of Claims 1 or 2 , characterized in that the distance X2 is determined by detecting the distance X2. Method according to one of Claims 1 or 2 characterized in that the distance X2 in the shape is determined as determining the distance X1 between the cylinders (11, 12) in the pressure-off position and from the distance X1 a traveled displacement distance ΔX2 at which the non-rotatably driven printing cylinder begins to rotate, is subtracted. Method according to one of Claims 1 to 3 , characterized in that the diameter d _11B or the radius r _{11B of} the second printing cylinder (11) is determined according to the formula r _11B = n × r _12B or d _11B = n × d _12B . Method according to one of Claims 1 to 5 , characterized in that on the sleeve body (12B) of a respective forme cylinder (12) at least one printing plate is arranged. Method according to Claim 6 , characterized in that on the sleeve body (12B) of the respective form cylinder (12) at least one pressure plate is tensioned. Method according to one of Claims 1 to 7 , characterized in that on the sleeve body (11B) of a respective transfer cylinder (11) at least one transmission form is arranged. Method according to Claim 8 , characterized in that on the sleeve body (11B) of the respective transfer cylinder (11) at least one blanket is arranged. Method according to one of Claims 1 to 9 , characterized in that the diameter or the radius of a first printing cylinder (11) is predetermined and the diameter or the radius of a second printing cylinder (12) is determined. Method according to one of Claims 1 to 9 , characterized in that the sleeve diameters or sleeve radii of the sleeve bodies (11A, 12A) arranged on the basic bodies (11A, 12A) of a first printing cylinder (11) and a second printing group cylinder (12) are identical and the diameter or radius of both printing cylinder (11 , 12) is determined.

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