DE102020118254A1 - Control station of a sheet processing machine and method for aligning a sheet on a support surface - Google Patents

Abstract

The invention relates to a control station of a sheet processing machine, comprising at least one measuring device and at least one support surface for inspecting a sheet, the control station having at least one alignment device for aligning the sheet on the support surface.

Description

The invention relates to a control station of a sheet processing machine and a method for aligning a sheet on a support surface of a control station according to the preamble of claim 1 and claim 11.

Various measuring systems are used for quality control in processing machines. The printed product is often examined in inspection facilities with regard to color and register accuracy. In addition, a comparison can be made with a digital version, for example the preliminary PDF. For example, longitudinal register, axial register and diagonal register errors can be detected in this way. In particular, the optical density of colors and the LAB color space values can be measured. Such measuring systems are often designed as measuring tables and are integrated into the control station, for example. For example, handheld measuring heads and/or motorized measuring heads are used. For the analysis, the printed product, preferably the printed sheet, must be precisely positioned and/or aligned on the measuring table. Precise alignment is necessary, in particular, to allocate the corresponding zones. Pre-positioning is often done with a mechanical side sheet stop or a motorized side sheet stop or corresponding engravings on the measuring table. Conventionally, the sheet is aligned using a ruler and, in particular, at a zero mark located on the edge of a support surface.

through the DE 10 2017 200 868 A1 a measuring table or control station for a processing machine system, preferably a printing press, is known. In particular, the printed product and/or the sheet is held in position during the inspection by means of a vacuum. In particular, the negative pressure can be variably adjusted.

through the WO 2017/198649 A1 a control station is known which can be controlled by gestures.

The object of the invention is to provide a control console for a sheet processing machine and a method for aligning a sheet on a support surface.

The object is achieved according to the invention by the features of claim 1 and by the features of claim 11 .

The advantages that can be achieved with the invention are, in particular, that a printed product and/or the sheet can be aligned in a precise position on a support surface of the control console. In particular, manual and/or motorized lateral sheet stops can be dispensed with. Engravings or other markings for aligning a sheet in the horizontal direction H can also be dispensed with.

The sheet can be easily and accurately aligned via an optical signal on the measuring table. In particular, no mechanical stop is required for alignment. In particular, a sheet can be aligned more precisely by means of the optical signal than with a mechanical stop. Such a sheet is aligned using an alignment mark and/or sheet center mark. Inaccurate alignment due to alignment marks and/or measuring strips located too far in the middle of the sheet and/or at the end of the sheet can be prevented. In particular, an optical signal is projected onto the support surface, for example by means of a laser and/or an LED, and an alignment mark and/or a sheet center mark and/or a measuring strip can be aligned relative to the signal. A distance between an alignment signal and the alignment mark can be avoided, as a result of which greater accuracy can be achieved in sheet alignment. In particular, the zero mark and the alignment mark are aligned relative to each other.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

• 1 eine schematische Darstellung eines Leitstandes;
• 2 eine Darstellung eines Leitstandes mit einer Ausrichtvorrichtung in einer bevorzugten Ausführungsform.

Show it:

• 1 a schematic representation of a control station;
• 2 a representation of a control station with an alignment device in a preferred embodiment.

A control station 01 of a processing machine preferably has a number of components. Such processing machines are, for example, printing presses, preferably sheet-fed printing machines, preferably sheet-fed processing machines, or punches. The control station 01 and the processing machine, in particular the printing press, are connected to one another at least in terms of data technology and i. i.e. R. arranged in close proximity to each other. In such a printing machine is z. B. a rotary printing machine printing in an offset printing process or a printing machine printing in a non-impact printing process, i.e. without a printing forme, d. H. a so-called digital printing machine.

1. a) eine z. B. tischförmige, insbesondere plan ausgebildete Auflage 04, z. B. eine Auflagefläche mit einer z. B. in Schwarz ausgebildeten Oberfläche zur i. d. R. vollflächigen Aufnahme eines bogenförmigen Bedruckstoffes 06, insbesondere Bogen 06, z. B. eines Druckbogens aus Papier, Pappe oder Karton, wobei der insbesondere rechteckige Druckbogen Kantenlängen z. B. im Bereich von 110 mm × 900 mm oder größer aufweist und zur Prüfung eines mit der Druckmaschine auf ihn aufgebrachten Druckbildes aufgrund seiner Größe von einer am Leitstand 01 tätigen Person vorzugsweise beidhändig auf die Auflage 04 gelegt wird, wobei der auf der Auflage 04 aufgelegte bogenförmige Bedruckstoff 06 dort zu seiner Fixierung z. B. mittels schaltbarer Saugluft in seiner jeweiligen Lage gehalten oder zumindest haltbar ist,
2. b) eine z. B. optoelektronische Messeinrichtung 07 zum Messen einer Messgröße des auf der Auflage 04 aufgelegten bogenförmigen Bedruckstoffes 06, z. B. zum Messen einer Farbdichte und/oder eines Farbwertes und/oder eines Registers und/oder eines Passers in dem betreffenden mit der Druckmaschine auf den Bedruckstoff 06 aufgebrachten Druckbild,
3. c) mindestens eine vorzugsweise digitale Kamera 08 zur Erfassung von mindestens einer von einer Person mit mindestens einer seiner Hände am Leitstand 01 ausgeübten Geste, wobei die betreffende Kamera 08 z. B. als eine Halbleiterkamera mit mindestens einem Bildsensor, insbesondere mit einem CMOS-Bildsensor ausgebildet ist,
4. d) und eine insbesondere elektronische, vorzugsweise mindestens eine Recheneinheit aufweisende Bildverarbeitungseinrichtung 09 zur Verarbeitung und Auswertung von der betreffenden Kamera 08 erfasster Bilder, wobei von der betreffenden Kamera 08 erfasste Bilder insbesondere in Form digitaler Bilddaten von der betreffenden Kamera 08 z. B. über eine Datenleitung 11 oder drahtlos an die Bildverarbeitungseinrichtung 09 geleitet werden. Die Bildverarbeitungseinrichtung 09 ist ihrerseits z. B. über eine weitere Datenleitung 11 oder drahtlos datentechnisch z. B. mit der Steuereinheit 02 zur Steuerung der Druckmaschine verbunden. Die jeweilige diverse Einrichtungen und/oder Einheiten miteinander verbindende Datenleitung 11 ist z. B. als ein Datenbussystem ausgebildet.

The control station 01 has, in addition to a preferably electronic control unit 02, for the maschi technical, e.g. B. drive control of the printing press and connected to the control unit 02 at least one operating element 03, z. B. an emergency stop switch having man-machine interface at least the following assemblies or elements:

1. a) a z. B. table-shaped, in particular planar support 04, z. B. a support surface with a z. B. in black surface for generally full-surface recording of a sheet-shaped printing material 06, in particular sheets 06, z. B. a sheet of paper, paperboard or cardboard, the particular rectangular sheet edge lengths z. B. in the range of 110 mm × 900 mm or larger and to check a print image applied to it with the printing press due to its size by a person working at the control station 01, preferably with both hands on the support 04, with the one placed on the support 04 sheet-shaped printing material 06 there to fix it, e.g. B. is held or at least durable in its respective position by means of switchable suction air,
2. b) a z. B. optoelectronic measuring device 07 for measuring a measured variable of the sheet-shaped printing material 06 placed on the support 04, e.g. B. for measuring an ink density and/or a color value and/or a register and/or a register in the relevant print image applied to the printing substrate 06 by the printing press,
3. c) at least one, preferably digital, camera 08 for capturing at least one gesture made by a person with at least one of their hands at the control station 01, the camera 08 in question e.g. B. is designed as a semiconductor camera with at least one image sensor, in particular with a CMOS image sensor,
4. d) and an image processing device 09, in particular electronic, preferably having at least one processing unit, for processing and evaluating images captured by the camera 08 in question, with images captured by the camera 08 in question, in particular in the form of digital image data from the camera 08 in question, e.g. B. via a data line 11 or wirelessly to the image processing device 09. The image processing device 09 is itself e.g. B. via another data line 11 or wireless data technology z. B. connected to the control unit 02 for controlling the printing press. The respective various facilities and / or units connecting data line 11 is z. B. designed as a data bus system.

Measuring device 07 has a measuring bar 12 that extends above sheet-shaped printing substrate 06, preferably linearly, with measuring bar 12 of measuring device 07 above printing substrate 06, i.e. above the sheet-shaped printing substrate 06 placed on support 04 and preferably fixed there, in particular linearly, preferably in the in the 1 can be moved bidirectionally in the directions indicated by a double arrow, ie along a front side of the control station 01 facing the person. The relevant camera 08, which records at least one gesture, is advantageously arranged in or on the movable measuring beam 12. This arrangement is very advantageous in particular because the relevant camera 08 arranged in this way cannot be covered either by the printing material 06 or by the measuring bar 12 of the measuring device 07. The camera 08 in question is therefore freely accessible to the person working at the control station 01 at all times. In this case, the measuring bar 12 for executing a movement of a z. B. controlled or at least controllable motor 13 by the control unit 02, wherein at least the control of the motor 13 of the measuring beam 12 is contactless, in particular by at least one gesture performed by the person in a detection area 16 of the camera 08 in question and recorded by the camera 08 in question is actuated or at least operable. As an alternative or in addition to controlling the motor 13 of the measuring bar 12, a measuring process to be carried out with the measuring bar 12 of the measuring device 07 is controlled or at least can be controlled by at least one gesture made by the person in the detection area 16 of the camera 08 in question and recorded by the camera 08 in question. It is also possible to switch on and/or switch off the suction air required to fix a sheet-shaped printing material 06 placed on the support 04, e.g. B. actuated or at least actuated by at least one gesture, with the gesture captured by the relevant camera 08 z. B. at least one pneumatic valve is controlled or at least controllable. The gesture required by at least one hand of the person working at the control station 01 to actuate the motor 13 of the measuring beam 12 and/or to initiate the measuring process and/or to switch on the suction air was recorded in the image-evaluating image processing device 09, e.g. B. programmatically either previously defined or taught there, ie certain image data were defined that lead to the triggering of a specific control function.

In the preferred embodiment, the detection area 16 of the camera 08 in question faces away from the support 04, in particular directed vertically upwards, with the camera 08 in question having at least one in its detection area 16 gesture performed by the person is recorded, or the camera 08 in question can at least be used to record the at least one gesture performed by the person in its detection zone 16. The relevant camera 08 is preferably arranged in or on the measuring bar 12 at its end facing the person making the at least one gesture, e.g. B. in a range of up to 200 mm, starting from the front side of the control station 01 facing the person. B. ramp-shaped to the front side of the control station 01 is designed to fall inclined, this inclination relative to a horizontal z. B. is less than 30°, in particular less than 15°, the detection range 16 of the relevant camera 08 that detects the gesture performed by the person is e.g. B. at the same angle of inclination as that of the support 04 towards the front side of the control station 01, so that the central axis 17 of the detection area 16 of the relevant camera 08 is always arranged perpendicular to the support 04.

In an advantageous development of the solution found, in connection with the relevant camera 08, i.e. in particular also in or on the measuring beam 12, e.g. For example, a distance sensor 14 is provided next to the image sensor of camera 08, with distance sensor 14 measuring a distance between the camera 08 in question and the gesture made by the person, particularly in detection area 16, or with the distance sensor 14 measuring a distance between the camera 08 in question and of the gesture performed by the person in particular in the detection area 16 is at least measurable. Like the relevant camera 08, the distance sensor 14 is preferably arranged in or on the measuring bar 12 at its end facing the person making the at least one gesture. Due to the lens used by the relevant camera 08, for example, its detection range 16 begins at a first height of e.g. 100 mm e.g. B. above an upper boundary surface 18 of the measuring beam 12 and extends to a second height of z. e.g. 650 mm e.g. g. above the upper boundary surface 18 of the measuring bar 12. In the preferred embodiment of the solution found, only one gesture performed by the person in the measuring space defined in this way is permitted to trigger a control function and/or only one such gesture is used by the image processing device 09 for for controlling the motor 13 of the measuring beam 12 and/or for switching on the suction air that fixes the printing substrate 06 on the support 04 and/or for controlling a measuring process to be carried out with the measuring beam 12 of the measuring device 07. A control function is thus triggered or at least can be triggered by means of the gesture recorded by camera 08, but this control function is triggered or at least can be triggered depending on the measured distance of distance sensor 14. Due to the distance-dependent triggering of a control function, operational safety is increased, e.g. B. the measuring device 07 increased. A person working at the control station 01 also gains confidence in the limited measuring space in which gestures performed are suitable for triggering a control function. Elsewhere, i. H. outside of the defined measuring space, gestures have no effect with regard to a control function.

The distance sensor 14 has z. g. at least one laser, preferably two lasers arranged at positions spaced apart from one another, with which the distance between the camera 08 and the gesture performed by the person, e.g. B. is determined by using a triangulation method. Triangulation is a geometric method of optical distance measurement by measuring two angles within triangles. The calculation of the distance of a measurement object, e.g. B. the hand of a person performing a gesture to a straight base line connecting the positions of the lasers is carried out by means of trigonometric functions, with the two angles starting from this base line opening towards the measurement object, with an angle between the respective origins of these angles being defined by the positions of the Laser given distance is known. Alternatively, the distance sensor 14 z. B. be designed as an ultrasonic sensor and the distance to a gesture executing a person's hand z. B. by a transit time measurement between sending at least one ultrasonic pulse and receiving its echo. The distance sensor 14 provides its measured values z. B. the image processing device 09 available. The calculations to be carried out in the triangulation process are e.g. B. carried out in the image processing device 09 by its processing unit. Alternatively, the distance between the relevant camera 08 and the gesture made by the person can also be e.g. B. can be measured by means of two cameras 08 arranged at a distance from one another or by means of a camera 08 with two image sensors arranged at a distance from one another. The camera(s) 08 and/or the distance sensor 14 are preferably permanently active, so that a control command can be issued at the control station 01 at any time by means of a gesture.

The control station 01 preferably has additional assemblies. So e.g. B. provided at least one screen for displaying machine information, z. B. designed as a touch screen 19 screen 19, said at least one screen 21 z. B. as a large screen 21, a so-called wall screen 21 and is arranged in particular along the rear side of the control station 01. Furthermore, the control station 01 z. B. a Überda extending at least over the support 04, preferably in the vertical direction V 22 tion, wherein in the canopy 22 z. B. a lighting device 23 is arranged. This lighting device 23 has z. B. also at least one infrared light source. This lighting device 23 is z. B. arranged in such a way that it illuminates the associated detection area 16 of the camera 08 in question and as a result a gesture performed by a person at the control station 01 can be detected in the first place or at least qualitatively better.

The at least one control station 01 preferably has an alignment device. The at least one alignment device preferably includes an optical alignment device 24 for aligning and/or positioning a sheet 06 on the support surface 04 in at least one direction H, preferably a horizontal direction H. The at least one alignment device also includes a marking 25 and/or a stop 25 on the bearing surface 04 and/or on the edge of the bearing surface 04. An alignment mark 26 and/or a sheet 06 can be aligned and/or aligned in a transverse direction Q by means of the stop 25 and/or the marking 25. In particular, marking 25 and/or stop 25 is used for positioning and/or alignment in a transverse direction Q. In particular, direction Q, preferably transverse direction Q, is perpendicular to horizontal direction H and preferably runs parallel to the depth of control station 01. In addition to a Alignment mark 26 can also be used to align a sheet 06 based on the beginning and/or end of the sheet. Depending on the application, measuring strips can also be used for alignment in one of the two directions H; Q, preferably the horizontal direction H are used. In particular, the at least one optical alignment device 24 can be adapted to the element to be aligned.

Optical alignment device 24 is preferably arranged to generate and/or project an optical alignment signal on support surface 04. If a sheet 06 is present, the optical alignment device 24 is arranged to project and/or radiate the alignment signal onto the sheet 06. Optical alignment device 24 is preferably arranged such that it projects a sheet center line onto support surface 04 and/or sheet 06. In particular, the at least one optical alignment device 24 is generally designed as a light source, more preferably as a laser and/or LED. The laser is preferably designed as a line laser. The laser is preferably arranged to emit light and/or rays with a high contrast for the human eye, for example green light. Laser classes that do not require any special protective measures can be used for the application. The at least one optical alignment device 24 is preferably arranged above support surface 04 in a vertical direction V, in particular a direction running parallel to the height. An alignment mark 26 and/or the sheet 06 can be aligned and/or is aligned relative to the alignment signal. The at least one optical alignment device 24 is preferably arranged to emit a linear alignment signal. In a further preferred embodiment, for example for alignment in the transverse direction Q and the horizontal direction H, the at least one optical alignment device is arranged to emit a plurality of lines, for example perpendicular lines to one another. Four lines that are cuboid are also conceivable. Depending on the application, the shape and/or position of the alignment signal can be adjusted. The at least one optical alignment device 24 is preferably arranged coupled to a control unit and can be controlled depending on the application.

In a preferred embodiment, the at least one optical alignment device 24 is integrated into the at least one illumination device 23. The at least one optical alignment device 24 is preferably arranged to be adjustable in position mechanically, for example guided linearly. In particular, this changes the position of the at least one alignment signal. In particular, the at least optical alignment device 24 can additionally or alternatively be electrically switched and/or aligned. In particular, the emitted form and/or the position of the alignment signal can be changed. For example, a partial line can be used in the area of a measuring strip.

A sheet 06 must be aligned on a support surface 04 of a control station 01 for inspection. For this purpose, a control station 01 preferably has the alignment device described in the previous sections. This preferably comprises at least the at least one optical alignment device 24. The at least one optical alignment device 24 preferably generates and/or transmits an optical alignment signal onto support surface 04. Sheet 06 and/or an alignment mark 26 on a sheet 06 is and/or can be aligned relative to an optical alignment signal of the at least one optical alignment device 24, at least in a direction H, preferably the horizontal direction H. In the transverse direction Q, the sheet 06 and/or the alignment mark 26 is and/or can be aligned relative to a marking 25 and/or by means of a stop 25. The at least one optical alignment device 24 is positioned in the vertical direction V above support surface 04.

Reference List

01

control station

02

control unit

03

control element

04

support, support surface

05

-

06

substrate, sheet

07

Measuring device, inspection device

08

camera

09

image processing device

10

-

11

data line

12

measuring bar

13

engine

14

distance sensor

15

-

16

detection range

17

axis (16)

18

boundary surface

19

screen, touch screen

20

-

21

Large screen, wall screen

22

canopy

23

lighting device

24

Alignment device, optical

25

marking, stop

26

alignment mark

V

direction, vertical

H

direction, horizontal

Q

direction, transverse direction

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102017200868 A1 [0003]
• WO 2017/198649 A1 [0004]

Claims (19)

The control station (01) of a sheet processing machine, comprising at least one measuring device (07) and at least one support surface (04) for inspecting a sheet (06), the control station (01) having at least one alignment device for aligning the sheet (06) on the support surface (04 ), characterized in that the alignment device has at least one optical alignment device (24) for aligning the sheet (06) on the support surface (04) in at least one direction (H). control station claim 1 , characterized in that the at least one optical alignment device (24) is arranged to generate an optical alignment signal on the bearing surface (04). control station claim 1 or 2 , characterized in that an alignment mark (26) of a sheet (06) and/or the sheet (06) is arranged on the support surface (04) so that it can be aligned and/or aligned at least in the horizontal direction (H) relative to the alignment signal. control station claim 1 or 2 or 3 , characterized in that an alignment mark (26) and/or a sheet (06) can be aligned and/or aligned in a transverse direction (Q) by means of a stop (25) and/or a marking (25) on the support surface (04). is. control station claim 1 or 2 or 3 or 4 , characterized in that the at least optical alignment device (24) is arranged in the vertical direction (V) above the bearing surface (04). control station claim 1 or 2 or 3 or 4 or 5 , characterized in that the at least one optical alignment device (24) is designed as a laser and/or as an LED. control station claim 1 or 2 or 3 or 4 or 5 or 6 , characterized in that the at least one optical alignment device (24) is arranged to emit a linear alignment signal. control station claim 1 or 2 or 3 or 4 or 5 or 6 or 7 , characterized in that the at least one optical alignment device (24) and/or the position of the at least one alignment signal is arranged to be mechanically adjustable. control station claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8th , characterized in that the at least one optical alignment device (24) is arranged to be electrically switchable and/or alignable. control station claim 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8th or 9 , characterized in that the at least one optical alignment device (24) is integrated into the at least one lighting device (23). Method for aligning a sheet (06) on a support surface (04) for inspecting a sheet (06) in a control station (01) of a sheet processing machine, characterized in that the sheet (06) and/or an alignment mark (26) on a sheet ( 06) can be and/or is aligned at least in one direction (H) relative to an optical alignment signal of at least one optical alignment device (24). procedure after claim 11 , characterized in that a sheet (06) and/or an alignment mark (26) of a sheet (06) can be and/or is aligned relative to the optical alignment signal in the horizontal direction (H). procedure after claim 11 or 12 , characterized in that the sheet (06) and/or the alignment mark (26) of a sheet (06) can be aligned relative to a marking (25) and/or by means of a stop (25) in the transverse direction (Q) and/ or is aligned. procedure after claim 11 or 12 or 13 , characterized in that the at least one optical alignment device (24) emits and/or generates an optical signal on a bearing surface (04). procedure after claim 11 or 12 or 13 or 14 , characterized in that the at least one optical alignment device (24) is positioned in the vertical direction (V) above the bearing surface (04). procedure after claim 11 or 12 or 13 or 14 or 15 , characterized in that the at least one optical alignment device (24) emits laser beams and/or LED light. procedure after claim 11 or 12 or 13 or 14 or 15 or 16 , characterized in that the optical alignment signal can be mechanically adjusted and/or positioned differently by moving the optical alignment device (24). procedure after claim 11 or 12 or 13 or 14 or 15 or 16 or 17 , characterized in that the at least one optical alignment device (24) can be switched electrically and/or changed in shape and/or positioned. procedure after claim 11 or 12 or 13 or 14 or 15 or 16 or 17 or 18 , characterized in that the at least one optical alignment device (24) is integrated into the at least one lighting device (23).

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