DE102023126328A1 - Device and method for treating substrates - Google Patents

Abstract

The invention relates to a device for treating substrates, comprising two interacting processing cylinders that are mounted via bearing points in frame walls and between which the substrate can be inserted, wherein the substrate is processed as it passes through tool parts active in the cylinder gap from the group of cutting tools, punching tools, creasing tools, perforating tools and/or grooving tools, wherein a measuring bridge is formed that is firmly connected to a frame wall, wherein two sensors are permanently assigned to the measuring bridge and wherein the sensors are each designed to detect the distance of the measuring bridge to an outer contour of a respective processing cylinder. The invention also relates to a method for treating substrates.

Description

The invention relates to a device and a method for treating substrates.

Substrates are understood to mean, in particular, sheet-shaped substrates that are preferably printable or printed. Such substrates are processed by one or more processing steps, such as printing and/or coating and/or varnishing and/or cutting and/or punching and/or embossing and/or creasing and/or perforating.

For the continuous processing of sheet-shaped substrates, rotary systems with paired processing cylinders are known. The processing cylinders carry tools and form a cylinder gap into which the substrates can be inserted. As they pass through the cylinder gap, they undergo processing, and any resulting waste can be removed and disposed of in an orderly manner. Precise positioning of the processing cylinders relative to each other is required to ensure high processing quality.

From the DE 103 56 405 A1 A device for finishing, e.g., cutting, punching, embossing, foil transfer, and/or coating, printed paper, cardboard, cardboard packaging, corrugated cardboard, and plastics using a rotation process is known. In this device, the substrate can be inserted in the feed direction between a rotating counterpressure processing roller and a rotating processing roller and is processed as it passes through tool parts acting in the working gap. A delivery conveyor belt for form-free substrates, which is aligned approximately horizontally, is arranged directly downstream of the processing roller.

The device is designed exclusively for processing web-shaped substrates.

From the DE 103 56 413 A1 is a device for the finishing processing of printed paper or similar web-like substrates by means of a rotation process. In this process, the substrate can be inserted in the feed direction between a rotating counterpressure processing roller and a rotating processing roller and is processed as it passes through tool parts acting in the working gap. The counterpressure processing roller is arranged essentially next to a processing roller, and a delivery conveyor belt for form-free substrates, which is aligned approximately horizontally, is arranged directly downstream of the processing roller. The processing roller is double-sized and has grippers.

The EP 0 281 064 A1 , WO 2006/117646 A1 , DE 1 486 958 A and GB 969,753 A disclose devices for treating substrates with separating devices.

The problem with the operation of known devices is that parts of the device heat up and expand, primarily due to drive friction, which leads to an undesirable impact on the functioning of the known devices. Particularly problematic is the thermal expansion of the frame between the bearing points of interacting machine parts, such as rollers or cylinders, which together form a functionally essential cylinder gap. When using adjustably mounted rollers or cylinders, the thermal expansion can be counteracted by adjusting the rollers or cylinders. This proves to be complex, especially if the thermal expansion is not constant over time.

From the DE 10 2016 226 167 A1 A device for treating substrates is known in which undesirable thermal expansion effects are counteracted by the use of a tempering device for exclusively tempering a frame wall close to the drive.

The DE 10 2018 219 708 B3 discloses a device for treating substrates, in which an opening in the front side of a processing cylinder is penetrated by a tube through which a temperature control medium can flow, which tube is a component of a temperature control device.

According to the DE 10 2018 219 709 B3 Undesirable heating of a processing cylinder is counteracted by the targeted generation of an air flow that sweeps over the front side of the processing cylinder.

From the DE 10 2018 219 710 B3 The use of heat-insulating layers to reduce heat propagation in processing cylinders is known.

The DE 10 2017 222 716 B3 describes a printing material processing machine with a device for measuring and regulating the thermally variable distance between two rotational axes of die-cutting cylinders. The device uses a rod attached to a bearing of a processing cylinder and interacts with a sensor for detecting the distance between two rotational axes. The device does not detect the changes in the frame walls due to thermal expansion with sufficient accuracy in relation to the cylinder gap formed between the processing cylinders.

The invention is based on the object of creating a device and a method for treating substrates, with which the processing quality during separation or punching is improved.

The object is achieved according to the invention by the features of claim 1 and 14 respectively.

The advantages achievable with the invention are that substrates can be separated or punched with good processing quality.

The device for treating substrates can have a double-sized processing cylinder which carries positioning means designed to receive two tools which can be arranged one behind the other in the circumferential direction of the processing cylinder and has a sheet holding system for fixing the front edges of the sheet-shaped substrate and interacts with a single-sized processing cylinder.

The invention is also applicable to any other configurations of processing cylinder sizes, such as systems whose processing cylinder pairings are double-sized/double-sized or single-sized/single-sized, etc.

Embodiments of the invention are illustrated in the drawings and are described in more detail below.

• 1 eine schematische Darstellung einer Bogen verarbeitenden Maschine mit einer Vorrichtung zum Behandeln von Substraten in schematischer Darstellung;
• 2 eine schematische Darstellung einer Vorrichtung zum Behandeln von Substraten in Seitenansicht.

They show:

• 1 a schematic representation of a sheet processing machine with a device for treating substrates;
• 2 a schematic representation of a device for treating substrates in side view.

The device for treating substrates can be designed as a stand-alone machine.

According to a further embodiment, the device for treating substrates is a component of a substrate-processing machine, in particular a sheet-processing machine, and is operated inline with the components of the sheet-processing machine. The sheet-processing machine is, in particular, a sheet-fed printing press, as used, for example, in 1 The invention is described below using the example of a sheet-fed printing press, in particular an offset sheet-fed printing press. This description also applies analogously to other sheet-processing machines, in particular punching machines, as well as to a design of the device as a stand-alone machine. A design as a punching machine can, in particular, have the features of a sheet-fed printing press without printing units.

The sheet-fed printing press comprises a feed system for substrates, also referred to as a feeder 07. Substrates are understood to be, in particular, sheet-shaped workpieces made of paper, cardboard, paperboard, corrugated cardboard, plastic, or the like, which are preferably printable or printed. The substrates are present in the feeder 07 of the sheet-fed printing press as a stack and are separated from it and fed to the units of the sheet-fed printing press downstream of the feeder 07 via an acceleration system 08 and moved in a feed direction 11 through the units of the press. The sheet-fed printing press comprises at least one, preferably several, printing units 06. The printing units 06 each comprise, in particular, an impression cylinder 41 and a sheet guide cylinder 42, preferably designed as a transfer drum 42. A blanket cylinder 43 carrying a rubber blanket is assigned to the impression cylinder 41, and this, in turn, is assigned a plate cylinder 44 carrying a printing plate. The plate cylinder 44 is in contact with an inking unit 45 and preferably also with a dampening unit. In printing unit 06, the substrate sheet is guided in a conventional manner by the sheet holding systems provided on the printing cylinder 41 and sheet guide cylinder 42, printed in the printing gap formed between the printing cylinder 41 and the blanket cylinder 43, and transferred to the subsequent unit of the sheet-fed printing press, e.g., in the form of the next printing unit 06. One or more processing units 46 may be provided downstream of the printing unit(s) 06 or between the printing units 06.

The processing units 46 preferably comprise two processing cylinders 96; 97, one of which, preferably the lower one, has a sheet holding system and the other, preferably the upper one, has a tool carrier. The sheet holding system of the processing cylinder 96 can be designed as a clamping gripper system or a suction gripper system. The processing cylinders 96; 97 can have lateral measuring rings 196; 197.

The processing cylinders 96; 97 are arranged relative to each other, forming a cylinder gap. At least one of the processing cylinders 96; 97 carries a tool, which preferably comes from the group of cutting tools, punching tools, creasing tools, perforating tools, or grooving tools.

In the simplest case, a processing cylinder pair 96; 97 is formed by the printing cylinder 41 and blanket cylinder 43 of a printing unit 06. In this case, a printing unit 06 serves as the processing unit 46. In this case, the tensioning device for the blanket serves to secure the tool to the blanket cylinder 43.

The processing cylinders 96; 97 can be designed in a variety of ways.

According to an embodiment which is particularly suitable for punching and perforating applications, the upper processing cylinder 97 is designed as a full magnetic cylinder or carrier cylinder with magnetic segments for receiving magnetic sheets or magnetic sheets and the lower processing cylinder 96 is designed as a surface-hardened cylinder or with a hardened sheet fastened thereon.

According to another embodiment, which is particularly suitable for embossing or creasing or grooving applications, the upper processing cylinder 97 is designed as a full magnetic cylinder or carrier cylinder with magnetic segments for receiving magnetic sheets or magnetic sheets and the lower processing cylinder 96 is designed as a surface-hardened cylinder or with a hardened sheet fastened thereon or with a sheet with hard rubber / plastic.

In all of the above-mentioned cases, the lower machining cylinder 96 can be provided with mechanically acting tool carriers or lifting supports, in particular with a positive or non-positive engagement. The non-positively acting tool carriers or lifting supports are, in particular, designed to act magnetically.

The processing cylinder 97 can be assigned a counter cylinder 98 on its side facing away from the processing cylinder 96, which counter cylinder is in surface contact with the second processing cylinder 97. The counter cylinder 98 is shown schematically only in 1 shown.

The counter cylinder 98 is assigned to the processing cylinder 97 in such a way that when the processing cylinder 97 is bent, as occurs when processing substrate sheets in the gap between the two processing cylinders 96; 97, the force effect of the resulting bending force of the second processing cylinder 97 hits the counter cylinder 98, preferably in its center or near its center.

The counter cylinder 98 can have the same diameter as the second processing cylinder 97.

According to a further preferred embodiment, the device for processing substrates comprises a separating device 02 with a transport cylinder 03 and a stripping cylinder 04, between which the substrate can be inserted. The separating device 02 can be part of a separating unit 02, in particular a stripping unit. As the substrate passes through the cylinder gap between the transport cylinder 03 and the stripping cylinder 04, it is separated by at least one elevator into at least one waste part and at least one blank. The transport cylinder 03 and/or the stripping cylinder 04 are preferably designed as magnetic cylinders. A peeling device, which can be selectively attached to or detached from the cylinders, can be assigned to the transport cylinder 03 and/or the stripping cylinder 04 and/or the processing cylinders 96; 97.

Openings that can preferably be supplied with air supply means are formed in the outer surface of the transport cylinder 03.

In order to facilitate the replacement of tool parts or elevators, one or both processing cylinders 96; 97 can be assigned a peeling device for peeling at least one tool part.

The machining cylinders 96; 97 are mounted in a frame via bearings 111; 112. The frame can be designed as a monolithic cast box, as a welded part, or in another suitable form. The frame comprises lateral frame walls 109; 110 in which the bearings 111; 112 are formed. The bearings 111; 112 are preferably designed as multi-ring bearings, in particular three-ring bearings.

Each processing cylinder 96; 97 or an individual processing cylinder 96; 97 can be assigned an adjusting device, in particular an actuator, with which the rotational axis 203; 204 of the respective processing cylinder 96; 97 can be displaced in relation to the rotational axis 204; 203 of the other processing cylinder 97; 96. The adjusting device enables an adjustment of the cylinder gap between the processing cylinders 96; 97, e.g., to adapt to the thickness of the substrate to be processed. The adjusting device is in particular designed such that the distance between the processing cylinders 96; 97 in the region of the frame wall 109 near the drive can be adjusted independently of the distance between the processing cylinders 96; 97 in the region of the frame wall 110 remote from the drive. In other words, an inclination of the processing cylinders 96; 97 to each other or balanced.

The processing cylinders 96; 97 are preferably driven on one side, i.e., a drive torque is introduced only at one end of the respective processing cylinder 96; 97. A common drive with a gear train comprising drive gears or several individual drives can be provided for driving. If drive gears are provided, a drive gear is preferably arranged on each leg of the respective processing cylinder 96; 97, preferably outside the frame or in a hollow space of the frame. The hollow space can be delimited by a frame wall 109; 110 from the space in the frame that accommodates the processing cylinders 96; 97. The drive gears of the two processing cylinders 96; 97 preferably mesh with one another and are preferably connected via additional gear elements (not shown), in particular gears, to a drive motor, which can be designed as a central drive. The device for treating substrates can comprise one or more temperature control devices. According to one embodiment, the temperature control device can be designed to exclusively control the temperature of the frame wall 109 near the drive, i.e., without controlling the temperature of the frame wall 110 remote from the drive. In this case, the other frame wall 110 does not have a temperature control device. According to a further embodiment, the temperature control device can be designed to control the temperature of the frame wall 109 near the drive and also to control the temperature of the frame wall 110 remote from the drive. The one or more temperature control devices are designed in particular to control the temperature of the respective frame wall 109 near the drive and/or the frame wall 110 remote from the drive between the bearing points 111; 112 of the processing cylinders 96; 97.

The one or each temperature control device preferably comprises one or more cooling devices and/or one or more heating devices. The one or more cooling devices and/or the one or more heating devices are designed to control the temperature of the frame wall 109 near the drive, independently of the temperature control of the frame wall 110 remote from the drive, and are preferably, but not necessarily, arranged exclusively between the bearing points 111; 112 of the processing cylinders 96; 97. The one or each temperature control device can comprise a temperature control medium circuit formed in at least one of the frame walls 109; 110, or a heating plate fixed to at least one of the frame walls 109; 110, or an induction coil fixed, in particular glued, to at least one of the frame walls 109; 110, or an induction pad fixed, in particular glued, to at least one of the frame walls 109; 110 fixed Peltier element.

More preferably, the at least one temperature control device comprises one or two control circuits with which the temperature of the frame wall 109 near the drive can be controlled independently of the temperature of the frame wall 110 remote from the drive. The control circuits are designed in a conventional manner and each comprise a temperature sensor, a controller, and a controlled system. The respective temperature sensor is assigned to the respective frame wall 109; 110 such that it detects the temperature of the respective frame wall 109; 110 in the area between the bearing points 111; 112. The temperature forms the controlled variable of the respective control circuit.

Preferably, a setpoint for controlling the frame wall 109 near the drive to a temperature greater than the temperature of the frame wall 110 far from the drive is input to the temperature control device. The setpoint forms the reference variable of the respective control loop. A further setpoint for controlling the frame wall 110 far from the drive to a temperature lower than the temperature of the frame wall 109 near the drive can also be input to the temperature control device, which can form the reference variable of a further control loop.

The setpoint and the further setpoint represent the temperature or the state that occurs when the processing cylinders 96; 97 are continuously driven.

Preferably, before commissioning or after a prolonged downtime, one of the frame walls 109; 110 or both frame walls 109; 110 are tempered. The tempering is preferably carried out in such a way that the frame wall 109 near the drive is heated to a temperature above the temperature of the frame wall 110 far from the drive. The distance between the processing cylinders 96; 97 is then adjusted. This is preferably carried out in such a way that the distance has the same values everywhere, or the processing cylinders 96; 97 are aligned parallel to one another. The substrate can then be inserted and processed between the processing cylinders 96; 97. Preferably, the frame wall 110 far from the drive is tempered to a temperature below the temperature of the frame wall 109 near the drive during the tempering of the frame wall 109 near the drive. The temperature of the frame wall 110 far from the drive is preferably above the ambient temperature. In particular, to support tempering or preheating, the processing cylinders 96; 97 can also be driven during tempering. Preferably, the frame wall 109 close to the drive is tempered to a setpoint for tempering the frame wall 109 close to the drive and the frame wall 110 far from the drive is tempered to a further setpoint that is different from the setpoint for tempering the frame wall 109 close to the drive, wherein the setpoint for tempering the frame wall 109 close to the drive and the further setpoint represent the temperatures that result when the processing cylinders 96; 97 are continuously driven in the respective frame wall 109; 110, in particular at an ambient temperature between 17 and 23 degrees Celsius, e.g. as a result of the frictional heat of the drive and/or the bearing points 111; 112 and/or due to other influences. The setpoint and the further setpoint are ideally selected such that in continuous operation the temperatures required for the two frame walls 109; 110 set temperatures remain constant without the need for temperature control by the temperature control device. This state is achieved when the amount of heat supplied by friction is equal to the amount of heat dissipated to the environment due to the temperature gradient between the frame walls 109; 110 and the environment.

Instead of or in particular in addition to the temperature control of the frame walls 109; 110, it is necessary to detect the position of the processing cylinders 96; 97 relative to each other, which depends on the thermal expansion of the frame walls 109; 110.

For this purpose, a measuring bridge 199 is formed, which is firmly connected to a frame wall 109; 110. Two sensors 201; 202 are permanently assigned to the measuring bridge 199. The two sensors 201; 202 are each designed to detect the distance of the measuring bridge 199 from an outer contour of a respective processing cylinder 97; 96.

The measuring bridge 199 preferably extends along a virtual connecting line running perpendicular to the rotation axes 203; 204 of the processing cylinders 96; 97 between the rotation axes 203; 204 of the processing cylinders 96; 97. The connecting line is, in particular, a connecting straight line.

The sensors 201; 202 are in particular each assigned to one end of the measuring bridge 199. Preferably, the two sensors 201; 202 are arranged on a connecting line, in particular a straight line, running perpendicular to the rotation axes 203; 204 of the processing cylinders 96; 97 between the rotation axes 203; 204 of the processing cylinders 96; 97.

The sensors 201; 202 preferably have a detection direction that runs along a connecting line, in particular a straight line, that runs at right angles to the rotation axes 203; 204 of the processing cylinders 96; 97 between the rotation axes 203; 204 of the processing cylinders 96; 97.

The sensors 201; 202 are preferably designed as optical sensors or capacitive sensors or inductive sensors.

If the sensors 201; 202 are inductive sensors, they can be designed in particular to detect a vortex field.

If the sensors 201; 202 are designed as optical sensors, a light beam can be directed laterally into a gap to be measured, and a respective sensor 201; 202 can be arranged on the side of the gap to be measured opposite the light source. In this embodiment, the respective sensor 201; 202 is designed to detect the width of the light beam passing through the gap.

Further preferably, the sensors 201; 202 have a detection direction and/or are arranged with a detection direction that runs along a connecting line, in particular a straight line, running at right angles to the rotation axes 203; 204 of the processing cylinders 96; 97 between the rotation axes 203; 204 of the processing cylinders 96; 97.

The measuring bridge 199 may be made of a material having a thermal expansion coefficient of less than 3 × 10 ^-6 K ^-1 .

In particular, the measuring bridge 199 may be made of Invar or an alloy exhibiting the Invar effect.

The measuring bridge 199 may also consist of a carbon fiber reinforced plastic or contain a carbon fiber reinforced plastic.

Preferably, the measuring bridge 199 is made of an alloy containing iron and nickel.

In particular, the measuring bridge 199 may be made of an alloy containing more than fifty percent iron or more than sixty percent iron or exactly fifty-four percent iron or exactly sixty-four percent iron.

The nickel content of the alloy is preferably 25 percent or more than 30 percent, or exactly 29 percent, or exactly 36 percent. In addition to iron and nickel, the alloy may also contain cobalt.

Preferably, the alloy consists of more than fifteen percent or exactly seventeen percent cobalt.

The outer contour to which the sensors 201; 202 detect the distance is in particular a surface, in particular a lateral surface, of a measuring ring 196; 197 formed on the respective processing cylinder 96; 97.

The measuring rings 196; 197 can be constructed in the manner of bearer rings known per se in printing press construction, but unlike bearer rings, they have diameters that are smaller than the diameters of the cylinders on which they are formed. Furthermore, the measuring rings 196; 197 are not elements of the forced guidance and do not roll on one another. Preferably, the diameters of the measuring rings 196; 197 are smaller than eighty percent or less than seventy percent of the diameters of the processing cylinders 96; 97 in the regions in which the cylinder gap for processing the substrates is formed. In particular, the diameters of the measuring rings 196; 197 can be in the range of thirty to eighty percent of the diameters of the processing cylinders 96; 97.

The measuring rings 196; 197 are preferably made of tempered steel and are, in particular, ground to a high-precision round and dimensionally accurate finish. The measuring rings 196; 197 are also preferably approximately 1-4 cm wide.

The advantage of such a design of the device for treating substrates is, in particular, that the effects of temperature changes on the direct connecting line on the frame walls 109; 110 can be detected.

Based on the knowledge that a respective frame wall 109; 110 can deform, in particular expand, locally unevenly due to different material thicknesses, different surface properties and the resulting locally different thermal conduction properties, the measuring bridge 199 is arranged in such a way that only the parts of the deformation, in particular expansion, relevant for the processing quality are recorded.

According to a method that can be used with the device described above, the distance of the measuring bridge 199 from each processing cylinder 96; 97 is detected by two sensors 201; 202, and the sum of the detected distance values is calculated. The sum is fed to a control or regulating device for controlling or regulating the distance from the rotation axes 203; 204 of the processing cylinders 96; 97.

In particular, the sum of the detected distance values can be compared with a reference value, and an actuator can be controlled by the control or regulating device depending on the result of the comparison. The actuator is controlled in such a way that the position of the rotation axis 203; 204 of one processing cylinder 96; 97 is adjusted or changed relative to the position of the rotation axis 204; 203 of the other processing cylinder 97; 96.

The actuator can also be designed as a tempering device for tempering one or both frame walls 109; 110 to a predetermined temperature or for independent tempering of both frame walls 109; 110 and/or for tempering one or both processing cylinders 96; 97.

The sensors 201; 202 can also detect the distances multiple times per revolution, at predetermined time intervals, or after a certain number of revolutions. Alternatively or additionally, the sensors 201; 202 can also be configured to detect the distance while the processing cylinders 96; 97 are at a standstill.

After setting up the device for a current production order, the distance values detected by the sensors 201; 202 and in particular their sum can be stored and used as a reference value, in particular taking into account a tolerance, for the production operation.

List of reference symbols

01

-

02

Separator, separating device

03

Transport cylinder

04

Stripping cylinder

05

-

06

printing unit

07

Investors

08

acceleration system

09

-

10

-

11

Feed direction

41

printing cylinder

42

Sheet guide cylinder, transfer drum

43

blanket cylinder

44

plate cylinder

45

inking unit

46

machining center

96

Machining cylinder, first

97

Machining cylinder, second

98

Counter cylinder

109

Frame wall, near the drive

110

Frame wall, remote from drive

111

storage location

112

storage location

196

measuring ring

197

measuring ring

198

-

199

measuring bridge

200

-

201

sensor

202

sensor

203

Rotation axis (96)

204

Rotation axis (97)

QUOTES CONTAINED IN THE DESCRIPTION

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

Cited patent literature

• DE 103 56 405 A1 [0004]
• DE 103 56 413 A1 [0006]
• EP 0 281 064 A1 [0007]
• WO 2006/117646 A1 [0007]
• DE 1 486 958 A [0007]
• GB 969,753 A [0007]
• DE 10 2016 226 167 A1 [0009]
• DE 10 2018 219 708 B3 [0010]
• DE 10 2018 219 709 B3 [0011]
• DE 10 2018 219 710 B3 [0012]
• DE 10 2017 222 716 B3 [0013]

Claims (17)

Device for treating substrates, comprising two interacting processing cylinders (96; 97) which are mounted in frame walls (109; 110) via bearing points (111; 112) and between which the substrate can be inserted, wherein the substrate is processed as it passes through tool parts active in the cylinder gap from the group of cutting tools, punching tools, creasing tools, perforating tools and/or grooving tools, wherein a measuring bridge (199) is formed which is firmly connected to a frame wall (109; 110), wherein two sensors (201; 202) are firmly assigned to the measuring bridge (199), and wherein the sensors (201; 202) are each designed to detect the distance of the measuring bridge (199) to an outer contour of a respective processing cylinder (97; 96). Device according to Claim 1 , characterized in that the measuring bridge (199) extends in the direction of an imaginary connecting line running at right angles to the axes of rotation (203; 204) of the processing cylinders (96; 97) between the axes of rotation (203; 204) of the processing cylinders (96; 97). Device according to Claim 1 or 2 , characterized in that the sensors (201; 202) are arranged on a connecting line extending at right angles to the axes of rotation (203; 204) of the processing cylinders (96; 97) between the axes of rotation (203; 204) of the processing cylinders (96; 97). Device according to Claim 1 , 2 or 3 , characterized in that the sensors (201; 202) have a detection direction which runs along a connecting line which runs at right angles to the axes of rotation (203; 204) of the processing cylinders (96; 97) between the axes of rotation (203; 204) of the processing cylinders (96; 97). Device according to Claim 1 , 2 , 3 or 4 , characterized in that the sensors (201; 202) are optical sensors or capacitive sensors or inductive sensors. Device according to Claim 1 , 2 , 3 , 4 or 5 , characterized in that the outer contour is a surface of a measuring ring (196; 197) formed on the respective processing cylinder (96; 97). Device according to Claim 1 , 2 , 3 , 4 , 5 or 6 , characterized in that the measuring bridge (199) consists of a material which has a thermal expansion coefficient of less than 3 × 10 ^-6 K ^-1 . Device according to Claim 1 , 2 , 3 , 4 , 5 , 6 or 7 , characterized in that the measuring bridge (199) consists of a carbon fiber reinforced plastic or contains a carbon fiber reinforced plastic. Device according to Claim 1 , 2 , 3 , 4 , 5 , 6 , 7 or 8 , characterized in that the measuring bridge (199) consists of an alloy containing iron and nickel. Device according to Claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 or 9 , characterized in that the measuring bridge (199) consists of an alloy which contains more than fifty percent iron or more than sixty percent iron or exactly fifty-four percent iron or exactly sixty-four percent iron. Device according to Claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 or 10 , characterized in that the measuring bridge (199) contains more than twenty-five percent nickel or more than thirty percent nickel or exactly twenty-nine percent nickel or exactly thirty-six percent nickel. Device according to Claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 or 11 , characterized in that the measuring bridge (199) consists of an alloy containing more than fifteen percent or exactly seventeen percent cobalt. Device according to Claim 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 or 12 , characterized in that at least one of the processing cylinders (96; 97) has a sheet holding system for fixing the leading edges of sheet-shaped substrate. Method for treating substrates, in particular using a device according to one of the Claims 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 or 13 , wherein two interacting processing cylinders (96; 97), which are mounted via bearing points (111; 112) in frame walls (109; 110) and form a cylinder gap, process substrate introduced into the cylinder gap as it passes through tool parts active in the cylinder gap and two sensors (201; 202) record the distance of the measuring bridge (199) to a respective processing cylinder (96; 97) and the sum of the recorded distance values is formed and fed to a control or regulating device for controlling or regulating the distance from rotation axes (203; 204) of the processing cylinders (96; 97). Procedure according to Claim 14 , characterized in that the sum of the detected distance values is compared with a reference value and an actuator is controlled by the control or regulating device as a function of the result of the comparison, which adjusts or changes the position of the rotation axis (203; 204) of one processing cylinder (96; 97) relative to the position of the rotation axis (204; 203) of the other processing cylinder (96; 97). Procedure according to Claim 14 or 15 , characterized in that after setting up the device for a current production order, the sum of the recorded distance values is stored and used as a reference value, in particular taking into account a tolerance, for the production operation. Procedure according to Claim 16 , characterized in that the sensors (201; 202) each detect the distance of the measuring bridge (199) to measuring rings (196; 197) formed on the respective processing cylinders (96; 97).

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