Measuring gripping device and stretching device

Abstract

To provide a measuring gripping device that can detect changes occurring in a stretching device, particularly a frictional force occurring between a guide rail and a gripping device, and can also detect process-mediated factors such as temperature or tensile force of an elongated material, thereby optimizing a stretching process.SOLUTION: The present invention relates to a stretching device including a measuring gripping device and a cross direction orienter, a machine direction orienter, and / or a simultaneous stretching device. The measuring gripping device includes a base 110, at least one guide device, and at least one gripping device 130. The gripping device 130, attached to the base 110 of the measuring gripping device, grips an elongated material. The guide device attached to the base 110 guides the measuring gripping device 100 along a guide rail. The measuring gripping device 100 includes a detection device 300 that captures measurement data during operation of the measuring gripping device 100 in the stretching device.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a measurement gripping device for acquiring measurement data during the operation of a stretching device, a stretching device, and a method for acquiring measurement data of a stretching device.

Background Art

[0002] Stretching devices are particularly used in the production of resin films. A stretching material usually composed of a resin film is clamped by a gripping device and moved together with the stretching device. The gripping device, which is driven either simultaneously or individually, is moved and guided along an annular guide rail.

[0003] During the actual stretching operation, the stretching device, which is subjected to a large external force, is exposed to high loads, wear, and breaking forces. Specific load conditions are imposed on the gripping device.

[0004] Another important element of the stretching device is a drive system called a conveying device having a guide rail and a drive device. The guide rail is laid entirely or partially in a heating furnace in any case, enabling temperature control of a long material (especially a resin film) before and / or after the stretching process (especially when heating or maintaining at a predetermined temperature).

[0005] The annular guide rail guides the gripping device along a moving trajectory. The drive device moves a plurality of gripping devices along the guide rail. For this purpose, the gripping devices form a chain device and / or are interconnected in a chain device manner.

[0006] It is particularly important to minimize and evenly maintain the frictional force generated between the guide rail and the gripping device, and to avoid problems as much as possible to perform the stretching process of the long material. The actual frictional force varies partially. The variation of the frictional force is affected by various factors such as the non-flatness of the guide rail (e.g., unevenness at the rail joint), deformation of the guide rail, and / or differences in partial surface roughness (e.g., due to wear and scratches).

[0007] Even after the stretching device has already been activated, for example, heating by a heating furnace, settlement of the base of the stretching device, and / or wear and tear on the guide rails can be factors contributing to friction fluctuations. Also, friction depends on the process factors that take precedence during the stretching of the long workpiece. The process factors are particularly due to the moving speed, temperature, stretching force, thickness of the long workpiece, etc.

Summary of the Invention

Problems to be Solved by the Invention

[0008] Techniques for monitoring the power (driving force) of a driving device to detect any changes occurring in a stretching device, particularly changes in friction, at an early stage are known. When the driving force increases, there are drawbacks such as an increase in friction and also an increase in wear and damage. Conventional monitoring devices cannot limit partial changes.

Means for Solving the Problems

[0009] An object of the present invention is to detect changes occurring in a stretching device, particularly the friction generated between a guide rail and a gripping device. Also, by implementing the present invention, process intermediate factors such as the temperature or tensile force of the long workpiece can be detected, and the stretching process can be optimized.

[0010] The object of the present invention is achieved by the measuring gripping device described in claim 1, the stretching device described in claim 13, and the method for capturing measurement data of the stretching device described in claim 17. Also, other features of the present invention are described in the dependent claims and in the following detailed description.

[0011] The object of the present invention is achieved by a measuring gripping device for a stretching device. For example, the stretching device may be a transverse orienter, a machine direction orienter, and / or a simultaneous stretching device. The measuring gripping device includes a base body, at least one guiding device, and at least one gripping device.

[0012] The gripping device is attached to the base body, and at least a part of the gripping device is configured integrally with the base body or fixed to a predetermined position of the base body, for example. In an embodiment of the present invention, the gripping device is attached to a predetermined position of the base body by a threaded fixture, welding, rivet joining, and / or other methods.

[0013] At least one gripping device movably secures a long member (e.g., a resin film to be stretched) to the stretching device. In particular, the gripping device clamps the long member in front of or in the inlet region of the stretching device. If the long member is clamped by the gripping device and the gripping device for measurement and conveyed by the stretching device, the long member is released from the gripping of the gripping device at or after the outlet region of the stretching device.

[0014] The gripping device includes at least one tongue piece axially attached to the base body. The rotatable tongue piece clamps the long member between the tongue piece and the gripping surface that intersects the gripping surface of the base body.

[0015] At least one guiding device provided on the base body of the gripping device guides the gripping device for measurement along the guide rail. The guiding device can be configured integrally with the base body or attached to the base body (directly or indirectly). For example, the guiding device can be reliably connected to the base body. As an example, the guiding device includes a slider (e.g., a sliding piece) that is reliably fitted into a corresponding gap of the base body. Another example of the guiding device is a guide roller that rolls on the guide rail of the stretching device.

[0016] In particular, a large number of guiding devices are provided and / or the guiding device is configured to support the guiding device (U-shaped cross-section) on at least two (preferably three or four) of the guide rails to guide the gripping device for measurement with the guide rail.

[0017] The gripping device for measurement also includes a detection device that captures measurement data during the operation of the gripping device for measurement of the stretching device.

[0018] When the gripping device for measurement grips a long workpiece and guides the gripping device for measurement along the guide rail of the stretching device, similar to other gripping devices of the stretching device, the detection device captures the measurement data of the area. This means that the measurement data is assigned to an appropriate position on the guide rail. For example, it means that the area can be easily identified and a specific change in the frictional force in the stretching device can be detected.

[0019] For example, process factors such as the current conveying speed, temperature, long workpiece thickness, and / or long workpiece type can be compared with the measurement data and evaluated. In this way, changes occurring in consideration of process factors affecting the frictional force can be determined. For example, it is possible to identify whether a change in the frictional force measured due to wear and fracture or a (desired) change in the process factor has occurred.

[0020] In particular, the gripping device can infer the state of the guide rail and the state of the (measurement) gripping device from the measurement data captured. For example, when the detection external force acting on the gripping device for measurement from the conveying direction of the long workpiece or its lateral direction increases regardless of the position of the gripping device for measurement on the traveling rail, this is determined as normal wear and tear and scratches of the gripping device or the traveling rail. Detecting a partial increase in the external force acting on the gripping device for measurement in the conveying direction of the long workpiece allows for an estimation of partial damage and / or contamination of the traveling rail.

[0021] In an embodiment of the present invention, the gripping device for measurement is configured as a part of the stretching device, and for that purpose, the conventional gripping device of the stretching device can be replaced with the gripping device for measurement. The gripping device for measurement can be replaced quickly (e.g., within a few minutes), and the existing device can also be measured by at least one gripping device for measurement. In addition, a long-term supply stop period due to replacement can be avoided.

[0022] The gripping device for measurement is provided with a power storage device that supplies power (electrical energy) to the detection device to capture measurement data. The power storage device is, for example, a battery or a rechargeable battery. Additionally or alternatively, a generator that supplies power to the detection device may be provided in the gripping device for measurement. For example, an induction coil that induces power as the gripping device for measurement moves is provided in the generator. Alternatively, for example, a generator that converts rotational energy into power can be connected to a roller.

[0023] The measurement data captured by the detection device (particularly the external force acting on the gripping device for measurement and / or acceleration, temperature, etc.) can be stored and / or transferred after capture.

[0024] For this purpose, a data storage device that stores the measurement data to be captured and / or a transmitter that wirelessly transmits the measurement data captured and / or stored can be provided in the detection device.

[0025] For example, a solid state drive, a hard disk drive, or a flash memory (such as an SD card, a USB memory stick, etc.) can be used as the data storage device. The capacity of the storage device can be determined by the storage capacity for measurement data for several hours, days, or weeks. The data storage device can be removed, and the data stored can be read and / or transferred wirelessly.

[0026] A transmitter that permanently transmits the measurement data captured and stored can be used. In this case, a plurality of receiving antennas that receive the data to be transmitted can be arranged along the guide rail.

[0027] The measurement data captured only at a specific time can be transmitted and stored. A permanent wireless communication connection device is not required. For example, when the gripping device for measurement is arranged outside the heating furnace of the stretching device and / or when the stretching device is stopped or operating at a low speed, the measurement data can be transmitted. Therefore, the installation of the antenna or the receiving device in the heating furnace can be omitted.

[0028] A detection device for receiving signals, particularly for receiving control signals, can be provided. For example, it is possible to start or end measurements by the detection device based on a control signal, and also to transmit a command signal for measurement data to be captured. It is also possible to use the control signal to command the retransmission of measurement data that was not accurately received. Additionally, the capture of measurement data can be controlled by the control signal. For this purpose, for example, the detector of the detection device can be selected and / or the monitoring speed can be set.

[0029] In an embodiment of the present invention, the detection device includes at least one detector such as a temperature detector, a force detector, particularly a strain gauge, a piezoelectric detector, an acceleration detector, a Hall effect detector, etc.

[0030] A plurality of, preferably different, detectors can be used to set the corresponding captured data in relation to each other (sensor fusion, a technique of integrating information obtained from a plurality of sensors that meet certain criteria and automatically performing information processing according to the purpose to assist the user's decision-making). This enables detailed and reliable decisions regarding equipment and / or process factors. For example, the state of a guide rail or a gripping device can be estimated from the measurement data to be captured. For this purpose, for example, different external forces can be detected.

[0031] In particular, an external force acting on at least one guiding device (particularly, in the moving direction L of the measurement gripping device (in the lateral direction) and / or in a direction lateral to the moving direction L) can be detected by the detection device.

[0032] For example, an external force on a measurement gripping device moving in the conveying direction (for example, what is called the longitudinal external force of a chain device) is measured. This external force is, for example, a measured value of the partial frictional force of the chain device that can be detected by a strain gauge.

[0033] Also, it is possible to determine an external force (particularly a compressive force) in the lateral direction P that preferably acts between the guide rail and the guiding device with respect to the conveying direction L of the measurement gripping device.

[0034] At least one guiding device includes a slider or a roller. When attaching a detector to the slider, a compression force detector (e.g., a piezoelectric detector) can be arranged on one of both sides of the slider facing away from and spaced from the guiding rail. For example, the compression force detector can be arranged between the base body and the slider. An external force in the transverse direction P with respect to the moving direction L of the gripping device for measurement can be detected by the compression force detector.

[0035] When attaching a detector to the guiding roller, a radial external force and / or an axial external force acting on the guiding roller or its roller shaft can be detected by the detector. For example, at least one strain gauge can detect the radial external force and / or the axial external force.

[0036] The compression force detector and the radial and / or axial force detector can detect fluctuations in the normal external force between the guiding device and the guiding rail. This indicates non-uniformity due to the guiding rail and / or contamination.

[0037] In addition, when the gripping device for measurement includes at least one detector (e.g., a strain gauge) for detecting the tensile force of the long material (especially a thin film) gripped by the gripping device, the stretching process can be monitored.

[0038] Similarly, the temperature of the gripping device, especially in the guiding rail region and / or the gripping device region, can be measured (by at least one temperature detector). Similar to the detection of the tensile force, conclusions regarding the stretching process can be drawn from the detection of the temperature. All process factors such as the temperature in various regions of the heater, the air ejection speed, the long material conveying speed, the long material thickness, the stretching state, etc. can be set or adjusted (especially controlled).

[0039] In an embodiment of the present invention, the gripping device for measurement can be accelerated and / or decelerated by a driving device (especially a linear motor) of the stretching device.

[0040] In an embodiment of the present invention, the base is connected to the chain device. In particular, the base can be actively connected to the chain device that serves as the drive device of the gripping device. For this purpose, the base is provided with connecting means having a groove into which the roller shaft of the chain device is fitted, and the chain device is provided with corresponding connecting means including a roller shaft fitted into the groove serving as the connecting means of the base and a link plate, i.e., a connecting plate, that connects adjacent roller shafts to each other. Through these connecting means, the base can be reliably connected to the chain device. Further, the chain device drives the measuring gripping device and can particularly accelerate and / or decelerate.

[0041] In an embodiment of the present invention, the measuring gripping device includes at least one chain device. The chain device is fixed (e.g., reliably) to the base of the measuring gripping device or integrally attached to the base. The chain device of the measuring gripping device is connected to at least one further chain device and connected and integrated into the drive device of the stretching device. Similarly, the measuring gripping device has a number of chain devices in which at least one chain device is connected to the base.

[0042] The detection device detects an external force acting on at least one chain device, particularly an external force acting in the moving direction (external force in the chain length direction) and / or an external force acting in the lateral direction P with respect to the moving direction L of the measuring gripping device. The corresponding chain device is a chain device connected to the base and / or a chain device connected to a chain device connected to the base.

[0043] In particular, the chain device is a chain device including a chain roller and a link plate. In an embodiment of the present invention, the link plate is connected to the base, the chain roller is connected to the link plate, and the chain roller and the link plate are connected and integrated into or can be integrated into the drive device of the stretching device.

[0044] In particular, since the outer shape of the gripping device for measurement substantially corresponds to the outer shape of a typical gripping device of the stretching device, when attaching the gripping device for measurement to the stretching device, no further modification is required and there is no risk of collision or disharmony with other parts of the stretching device. For this reason, there is no wasted time or the risk of collision or disharmony with other parts of the stretching device such as a heating furnace or a driving device, and measurement data capture can be started directly after setting the gripping device for measurement without removing a part of the stretching device.

[0045] In particular, at least one force detector (for example, capturing an external force in the chain length direction) can be arranged in the chain device. In an embodiment of the present invention, the first force detector can be attached to the first link plate (for example, the upper link plate) of the chain device and / or the second force detector can be attached to the second link plate (for example, the lower link plate) of the chain device. Therefore, the tensile force in the length direction acting on the chain device can be determined extremely accurately. In particular, the chain device can be composed of chain rollers.

[0046] In addition, a detection device equipped with a timer can capture, store and / or transmit measurement data in chronological order. In particular, the progress of measurement data can be transmitted during the operation of the gripping device for measurement. For example, when the gripping device for measurement is arranged outside the heating device of the stretching device and / or when the stretching device is stopped or operated at a low speed, the progress of the transmitted data can be transmitted.

[0047] If the detection device is a Hall effect detector or a similar detector, when the gripping device for measurement moves along the guide rail and passes through the magnet, the magnetic field of at least one fixed magnet can be detected in a specific time. Through the time for capturing the magnetic field and recognizing the position of the magnet, the measurement data captured over time can be assigned to the position of the gripping device for measurement on the guide rail. The detected change in the measurement data can be specified extremely accurately.

[0048] For example, measurement data with a frequency of at least 2 kHz, at least 2.5 kHz or at least 3 kHz can be captured by the detection device. For example, a moving speed of a long material of 700 m / min and a resolution of about 5 mm occur at a measurement frequency of 2.5 kHz.

[0049] Also, at least 4, at least 8, at least 12, at least 16, or at least 32 different measurement data are read out in parallel or from the detection device. For this purpose, corresponding A / D converters and / or measurement data amplifiers are provided. Also, the detector can be read out sequentially. The measurement frequency can be reduced without reducing the resolution.

[0050] In an embodiment of the present invention, the detection device is a heat-resistant detection device. In particular, an electronic detection device and / or a heat-resistant material corresponding to the detection device are used, a cooler is provided, and it is covered with a heat-insulating material to achieve this. Measurement data can be captured by the heat-resistant detection device during the operation interval of the measurement gripping device in a stretching device where the operating temperature of the stretching device reaches at least 200°C, at least 300°C, or at least 400°C.

[0051] Also, the object of the present invention is achieved particularly by a stretching device comprising at least one guide rail and at least one measurement gripping device, such as a lateral orienter, a machine direction orienter, and / or a simultaneous stretching device. The at least one measurement gripping device is guided along the guide rail by a guiding device. Therefore, the measurement gripping device can be transported by the stretching device, simultaneously grip the long material to be stretched by the gripping device, and capture measurement data during the production activities of the stretching device. The captured measurement data can be used to optimize production process factors and / or control the stretching device.

[0052] The stretching device comprises at least one magnet arranged in at least one region of the guide rail. The measurement gripping device of the stretching device can detect the magnetic field of at least one magnet when the measurement gripping device guided along the guide rail passes through the magnet. When the magnetic field is captured and the position of the magnet is recognized, the measurement data captured over time can be assigned to the position of the measurement gripping device on the guide rail. The detected changes in the measurement data can be pinpointed extremely accurately.

[0053] In an embodiment of the present invention, the stretching device is arranged outside a specific part of the heating device and comprises at least one receiving device for receiving measurement data from the measurement gripping device.

[0054] In another embodiment of the present invention, the stretching device includes a gripping device for measuring different types of measurement data including first-type measurement data and second-type measurement data different from the first-type measurement data. For example, the first gripping device for measurement detects an external force acting on the gripping device for measurement, and the second gripping device for measurement detects the temperature acting on the gripping device for measurement. The measurement data captured by both gripping devices for measurement is assigned to a predetermined position on the guide rail and arranged in a correlation relationship with each other.

[0055] Furthermore, the object of the present invention is solved by a method for capturing measurement data of a stretching device including the following process: Arranging at least one gripping device for measurement on the guide rail of the stretching device; Guiding at least one gripping device for measurement along the guide rail and selectively gripping a long workpiece by the gripping device for measurement; Capturing measurement data by the gripping device for measurement; Storing the captured measurement data and / or transmitting the measurement data during or after moving the gripping device for measurement.

[0056] The method for capturing measurement data of the stretching device according to the present invention includes the process of assigning the captured measurement data to an appropriate position on the guide rail of the stretching device and the process of controlling the stretching device based on the captured measurement data.

Brief Description of the Drawings

[0057] Other features and advantages of the present invention will become apparent from the accompanying drawings and the following description corresponding to the accompanying drawings. The accompanying drawings show the following:

Figure 1

Figure 2

Figure 3

Figure 4A

Figure 4B

Figure 5A

Figure 5B

Figure 6

Embodiments for Carrying Out the Invention

[0058] FIG. 1 shows a stretching device 10 including a heating furnace 14 and two driving devices 16. The two driving devices 16 laid symmetrically with respect to the symmetry axis S of the stretching device 10 are also laid at least partially within the heating device 14. The feedback path of the driving device 16 is arranged outside the heating furnace 14. However, in the inlet region 18 of the heating furnace 14, the long member 12 of the stretching device 10 is gripped by the driving device 16, and in the outlet region 20 of the heating furnace 14, the long member 12 of the stretching device 10 is released from the driving device 16.

[0059] In addition to the inlet region 18 and the outlet region 20, the stretching device 10 includes at least another regions 22, 24 and 26. The regions 22, 24 and 26 adjacent to each other are arranged along the normal direction of the moving / tensioning direction R of the stretching device 10. First, the inlet region 18 is adjacent to the first region 22, the first region 22 is adjacent to the second region 24, the second region 24 is adjacent to the third region 26, and the third region 26 is finally adjacent to the outlet region 20.

[0060] Both driving devices 16 have a first interval separating from each other in the first region 22 called the preheating region of the stretching device 10 adjacent to the inlet region 18.

[0061] In the second region 24 called the stretching region, the interval between both driving devices 18 increases as a second interval until reaching the starting point of the third region 26 called the heating region.

[0062] Each of the two drive devices 16 includes a guide rail 17 for guiding a number of gripping pieces 28. The gripping pieces 28 are moved along the guide rail 17 by the drive of each drive device 16.

[0063] In FIGS. 1 and 2, only two gripping pieces 28 of each drive device 16 are schematically shown in a rectangle. However, the stretching device 10 has a number of gripping pieces 28. Also, it includes one or two or more gripping pieces 28. Further, one or two or more measuring gripping devices 100, 200 are guided along the guide rail 17. The gripping pieces 28 and the measuring gripping devices 100, 200 are substantially different from each other depending on the presence or absence of a detection device for capturing measurement data. Possible configurations of the measuring gripping devices 100, 200 are shown in FIGS. 3 to 5B.

[0064] The guide rail 17 of each drive device 16 is formed in an annular shape including an outward path and a return path from an inlet region 18 to an outlet region 20. The guide rail portion forming the outward path is arranged in the direction in which the gripping piece 28 moves between the inlet region 18 and the outlet region 20 in the heating furnace 14.

[0065] In the embodiment, the guide rail portion in the normal operation direction constituting the return path from the outlet region 20 back to the inlet region 18 is also arranged inside the heating furnace 14, but a return path may be formed outside the heating furnace 14 as in the embodiment shown in FIG. 2.

[0066] For example, the long material 12 to be stretched and composed of a resin film is supplied in the tensile direction R to the inlet region 18 of the stretching device 10, and the stretching device 10 is operated. For this purpose, the edges of the long material 12 moving in the tensile direction are attached to both drive devices 16.

[0067] Specifically, both edges of the long material 12 are gripped by the gripping devices 130, 230 (FIGS. 4A and 5A) of the gripping pieces 28 or the measuring gripping devices 100, 200, and by the movement of the (measurement) gripping pieces 28 and the measuring gripping devices 100, 200, both edges of the long material 12 are moved along the guide rail 17 of the drive device 16.

[0068] The elongate member 12 in the inlet region 18 has a width E perpendicular to the tensile direction R that substantially corresponds to the first interval between the drive devices 16. Thereafter, the elongate member 12 is supplied to the first region 22 and heated. In the next second region 24, i.e., the stretching region, since the widthwise interval between the drive devices 16 on both sides of the elongate member 12 continuously increases, the elongate member 12 is stretched. At the end of the second region 24, the elongate member 12 has a second width A.

[0069] After completion of the stretching process, when the elongate member 12 passes through the third region 26, it is annealed (internal stress relaxation treatment), and in the outlet region 20, the elongate member 12 is released from the gripping pieces 28 and the measuring gripping devices 100, 200, and the elongate member 12 with the lateral width A is discharged from the stretching device 10.

[0070] For example, the stretching device 10 is a lateral orienter abbreviated as a widthwise film stretching device or TDO. It is also possible to use, for the stretching device 10, a simultaneous stretching device that stretches the elongate member 12 in the lateral direction with respect to the tensile direction R and also stretches the elongate member 12 in the tensile direction R in the second region 24, i.e., the stretching region.

[0071] During the processing of the elongate member 12, a large tensile force in the tensile direction acts on the gripping pieces 28 in the second region 24, i.e., the stretching region. The tensile force gives priority to the main direction with respect to the gripping pieces 28 (FIG. 1), and the lateral tensile force with respect to the main direction P is small.

[0072] The gripping pieces 28 must withstand high tensile forces, especially the tensile force in the main direction P. The main direction P is the horizontal direction that occurs laterally with respect to the side edges of the elongate member 12 that the gripping pieces 28 grip. The main direction P determined by the arrangement of the guide rails 17 is substantially perpendicular to the moving direction L of the (measuring) gripping devices 100, 200.

[0073] The stretching device 10 includes at least one magnet 30 disposed in the region of at least one guide rail 17. When the measuring gripping devices 100, 200 are guided through the magnet 30, the magnetic field of at least one magnet 30 can be detected. At the time of detecting the magnetic field, further measured values can be assigned at appropriate positions on the guide rail 17.

[0074] FIG. 3 is a block diagram showing a gripping device 100 for measurement and a receiving device 430 connected to an evaluation device 450 connected by wire or wirelessly by a communication connector 435. The gripping device 100 for measurement includes a gripping device 130 that grips a long member 12.

[0075] In particular, the gripping device 130 includes at least one tongue piece 132 rotatably shaft-mounted on the base 100. The rotatable tongue piece 132 interacts with the gripping surface 112 of the base 110 to have the effect of gripping the long member 12 between the tongue piece 132 and the gripping surface 112. In particular, the gripping device 130 becomes a gripping piece 28 and has the effect of completely gripping the long member 12.

[0076] Furthermore, the gripping device 100 for measurement includes a detection device 300 that captures measurement data such as external force, acceleration, temperature, and / or magnetic field during the operation of the gripping device 100 of the stretching device 10.

[0077] The detection device 300 includes various different detectors such as, for example, the temperature detector 302 and the force detector 304 shown in the figure. The measurement data captured and transmitted via an A / D converter and / or an amplifier is stored in a data storage device 320 (for example, a solid-state drive, a hard disk drive, or a flash memory (SD card, USB memory stick, etc.)). The measurement data captured and / or stored can be transmitted by a transmitter 330 and received by a receiver 430 (not part of the gripping device for measurement).

[0078] As shown in FIGS. 4B and 5B, an antenna of the transmitter 330 directed in the direction of the long member 12 is attached to the gripping device for measurement, and the measurement data received by the receiver 430 can be transmitted to the evaluation device 450.

[0079] As an alternative or additionally, data can be transmitted from the data storage device 320 to a removable data storage device (such as an SD card), the removable data storage device can be removed, and the measurement data can be used. The data stored in the removable data storage device can be read (using a desktop computer), stored, and transmitted to the storage and evaluation device 450.

[0080] Furthermore, the measurement data can be used for optimizing process factors, particularly for controlling the stretching device.

[0081] Figures 4A and 4B illustrate a side view and a perspective view of the gripping device 100 for measurement.

[0082] The gripping device 100 for measurement includes a base body 110, a guiding device 140, and at least one gripping device 130. The gripping device 130 disposed on the base body 110 grips the long material 12. In particular, the long material 12 can be gripped between the tongue piece 132 to be axially attached and the gripping surface 112 of the base body 110.

[0083] The guiding device 140 provided on the base body 110 guides the gripping device 100 for measurement on the guiding rail of the stretching device.

[0084] In an embodiment of the gripping device 100 for measurement (Figure 4), the base body 110 is securely connected to the chain device 120 of the drive device 16 of the stretching device 10.

[0085] For example, by means of a threaded fastener 114 (Figure 4A), the base body 110 is fixed to the chain device 120 that is sequentially connected to the chain roller 122 via a pin 124 (Figure 4B).

[0086] The guiding device 140 has a number of sliders 142, 144. In particular, the guiding device 140 can be formed in a U-shaped cross-section surrounding the guiding rail 17 or the sliding rail. The sliders 142, 144 sliding on the guiding rail (not shown) guide the gripping device 100 for measurement on the guiding rail.

[0087] FIG. 4B shows an energy storage device 340 such as a storage battery or a (heat-resistant) battery that supplies power to the detection device 300, for example. The energy storage device 340 is disposed behind the tongue piece 132 (as viewed from the elongate member 12).

[0088] FIG. 4B shows a perspective view of the measuring gripper 100 different from FIG. 4A. The detection device 300, which is particularly composed of an electronic device having an A / D converter, an amplifier, and a data storage device, is disposed between the chain devices 120, particularly between two sliders 142, 144.

[0089] The detection device 300 is composed of different types of detectors. For example, it shows a temperature detector 302, a plurality of different force detectors 304, 304', 304", and a Hall effect detector 308. A (3-axis) acceleration detector and / or a yaw-axis angular velocity detector (around the Z-axis) are mounted on the electronic circuit board (e.g., a printed wiring board) of the detection device 300. In particular, another detector such as a pressure detector and / or a distance detector can also be attached. As detailed with respect to FIG. 5B, the measuring gripper can be provided with still another detector such as a temperature detector and / or an acceleration detector.

[0090] In particular, the detection device 300 can detect an external force acting on at least the guide device 140, particularly in the moving direction L and / or the lateral direction P with respect to the moving direction of the measuring gripper.

[0091] The guide device 140 includes sliders 142, 144, and a compression force detector (e.g., a piezoelectric detector 304') can be attached to the surfaces facing away from and opposing the guide rail, i.e., under the sliders 142, 44. The compression force detector 304' can be provided with an array detector that detects the compression force of the slider 142 and also captures a two-dimensional image of the compression force acting on the slider 142.

[0092] The array detector can detect all external forces, particularly all compression forces. For this purpose, the detectors of the array detector can be connected.

[0093] Attach the first force detector 304 to the first link plate (upper link plate) of the chain roller 122, and attach the second force detector 304" to the second link plate (lower link plate) of the chain roller 122, so that the tensile force acting on the chain roller 122 and the chain device 120 can be captured and determined.

[0094] In addition, at least one detector 304" (for example, a strain gauge not shown) for detecting the tensile force of the long member 12 (especially the resin thin film) held by the gripping device 130 can be provided in the measuring gripping device 100. In this way, the stretching process can be monitored.

[0095] The external force in the moving direction (chain length direction) acting on at least one chain device 120 and / or the external force acting in the lateral direction P with respect to the moving direction L of the measuring gripping device 100 can be detected by the detecting device 300 shown in FIG. 4B. For this purpose, the chain device 120 includes a force detector 304 provided on the first link plate (upper link plate) of the chain device 120. Another force detector 304 is provided on the second link plate (lower link plate) of the chain device 220.

[0096] FIGS. 5A and 5B show a side view and a perspective view of the measuring gripping device 200. The measuring gripping device 200 includes a base body 210, a guiding device 240, and at least one gripping device 230. The gripping device 230 attached to the base body 210 grips the long member 12. In particular, the long member 12 is gripped between the tongue piece 232 to be axially attached and the gripping surface 212 of the base body 210.

[0097] The guiding device 240 attached to the base body 210 guides the measuring gripping device 200 along the guiding rail 17 of the stretching device 10.

[0098] The guiding device 240 has a plurality of guiding rollers 242, 244, 246, 248, 242', 244' and 246'. The guiding rollers 242, 244, 246, 248, 242', 244' and 246' support the measuring gripping device 200 on the guiding rail 17 and fit the guiding rail 17 between the guiding rollers 242, 244, 246, 248, 242', 244' and 246' to guide the measuring gripping device 200 with the guiding rail 17.

[0099] Furthermore, the base body 210 is securely attached to the chain roller 222 via the connecting plate of the chain device 220 and the roller shaft (FIGS. 5A and 5B).

[0100] FIGS. 5A and 5B show an energy storage device 340 such as a battery or a (heat-resistant) storage battery that supplies power to the detection device 300.

[0101] FIG. 5B is a perspective view of the measuring gripping device 200 shown in a side view in FIG. 5A. The detection device 300 composed of electronic components having an A / D converter, an amplifier and a data storage device is arranged on the side portion of the gripping device 230 on the side opposite to the long member 12 gripped by the gripping device 230 in the operation space.

[0102] The detection device 300 includes a plurality of detectors of different types. In the illustrated example, the detectors are a temperature detector 302, a number of force detectors 304, particularly strain gauges, an acceleration detector 306 (for example, a three-axis rotational acceleration detector) and two Hall effect detectors 308.

[0103] In particular, the detection device 300 detects a single or a plurality of external forces acting on the guiding device 240 (particularly, the external forces in the moving direction L and / or the lateral direction with respect to the moving direction of the measuring gripping device 200).

[0104] The guiding device 240 shown in FIG. 5A includes a plurality of guiding rollers 242 to 248. As shown in FIG. 6, the force detector 304 (FIG. 5B), particularly the strain gauge, is attached to the shafts of the guiding rollers 242 to 248 to detect the radial external force and / or the axial external force acting on the guiding rollers 242 to 248 and their shafts.

[0105] The radial force detector and / or the axial force detector can detect changes in the normal external force acting between the guiding device 240, particularly between the guiding roller and the guiding rail.

[0106] In addition, the gripping device 200 for measurement is provided with at least one detector (for example, a strain gauge not shown in the figure) for detecting at least one tensile force of the long member 12 (particularly a resin thin film) gripped by the gripping device 230. At least one tensile force is transmitted via the guiding rollers 244 and 246 and absorbed by the guiding rollers 244 and 246. In this way, the stretching process can be monitored.

[0107] Similarly, the temperature of the gripping device 230 can be detected by the temperature detector 302 attached to the base 210. Similarly, the temperatures of the guiding rollers 244 and 246 and / or the chain device 220 can also be detected. For this purpose, corresponding temperature detectors are arranged at corresponding measurement points.

[0108] The detection device 300 shown in FIG. 5B can detect an external force acting on at least one chain device 220, particularly an external force acting in the moving direction L (the external force in the chain length direction) and / or in the lateral direction P with respect to the moving direction L of the gripping device 200 for measurement. For this purpose, the chain device 220 is provided with a force detector 304 provided on the first link plate (upper link plate) of the chain device 220. Another force detector 304 is attached to the second link plate (lower link plate) of the chain device 220.

[0109] In particular, since the outer shapes of the gripping devices 100 and 200 for measurement substantially correspond to the outer shape of the normal gripping device of the stretching device 10, no morphological modification is required when mounting the gripping devices 100 and 200 for measurement of the stretching device, and there is also no risk of disharmony with other components of the stretching device.

[0110] It is preferable that the measuring gripping devices 100 and 200 are provided with a plurality of tongue pieces 232 (i.e., two tongue pieces) as standard gripping pieces 28 used for the stretching device 10. The long member 12 is gripped by the tongue pieces 232 of the measuring gripping devices 100 and 200, and the long member 12 can be gripped uniformly and appropriately in the same manner as the standard gripping piece 28 and moved along the transport path. Thereby, the tensile force acting on the long member 12 can be realistically and reliably measured.

Explanation of Signs

[0111] 10 ··· Stretching device, 12 ··· Long member, 14 ··· Heating furnace, 16 ··· Driving device, 17 ··· Guide rail, 18 ··· Inlet region, 20 ··· Outlet region, 22 ··· Region (preheating region), 24 ··· Region (stretching region), 26 ··· Region (heat treatment region), 28 ··· Gripping piece, 30 ··· Magnet, 100 ··· Measuring gripping device, 110 ··· Substrate, 112 ··· Gripping surface, 114 ··· Connecting means, 120 ··· Chain device, 121 ··· Connecting means, 122 ··· Chain device, 124 ··· Pin, 130 ··· Gripping device, 132 ··· Tongue piece, 140 ··· Guide device, 142, 144 ··· Sliders, 200 ··· Measuring gripping device, 210 ··· Substrate, 212 ··· Gripping surface, 220 ··· Chain device, 222 ··· Chain roller, 230 ··· Gripping device, 232 ··· Tongue piece, 240 ··· Guide device, 242 ··· Guide roller, 244 ··· Guide roller, 246 ··· Guide roller, 248 ··· Guide roller, 300 ··· Detection device, 302, 304, 304’, 304", 306, 308 ··· Detectors, 320 ··· Data storage device, 330 ··· Transmitting device, 340 ··· Energy storage device, 430 ··· Receiving device, 435 ··· Communication connector, 450 ··· Evaluation device, A ··· Second width of the long member, E ··· First width of the long member, P ··· Main direction, L ··· Moving direction, R ··· Tensile direction, S ··· Symmetry plane,

Claims

1. In a measuring gripping device (100, 200) provided in a stretching device (10) having a transverse stretcher, a machine direction stretcher and / or a simultaneous stretching device, and comprising a base body (110, 210), at least one guiding device (140, 240), and at least one gripping tool (130, 230), at least one gripping tool (130, 230) of the measuring gripping device (100, 200) is attached to the base body (110, 210) of the measuring gripping device (100, 200) and grips a long material (12), at least one guiding device (140, 240) of the measuring gripping device (100, 200) is attached to the base body (110, 210) of the measuring gripping device (100, 200) and guides the measuring gripping device (100, 200) on a guide rail (17), The measuring gripping device (100, 200) is characterized in that it comprises a detection device (300) for capturing measurement data during the operation of the measuring gripping device (100, 200) of the stretching device (10).

2. The detection device (300) of the measuring gripping device (100, 200) comprises a data storage device (320) for storing the captured measurement data and / or a transmission device (330) for wirelessly transmitting the captured and / or stored measurement data. The measuring gripping device (100, 200) according to Claim 1.

3. The detection device (300) of the measuring gripping device (100, 200) comprises at least one detector among a temperature detector (302), in particular a strain gauge or a force detector (304) or a piezoelectric detector, an acceleration detector (306), a Hall effect detector (308). The measuring gripping device (100, 200) according to Claim 1 or 2.

4. The detection device (300) of the measuring gripping device (100, 200) detects an external force acting on at least one guiding device (140, 240), in particular an external force acting in the transport direction (L) of the measuring gripping device (100, 200) and / or in a direction (P) perpendicular to the transport direction (L). The measuring gripping device (100, 200) according to any one of Claims 1 to 3.

5. At least one guiding device (140, 240) of the measuring gripping device (100, 200) comprises a slider (142, 144) or a guide roller (242, 244, 246, 248). The measuring gripping device (100, 200) according to any one of Claims 1 to 4.

6. The detection device (300) of the gripping device (100, 200) for measurement includes at least one compression force detector (304), particularly a piezoelectric detector. The compression force detector (304) disposed between the base body (110) and the sliders (142, 144) of the gripping device (100, 200) for measurement detects an external force in a direction (P) perpendicular to the conveying direction (L) of the gripping device (100) for measurement. The detection device (300) of the gripping device (100, 200) for measurement includes at least one force detector (304), particularly a strain gauge, and the force detector (304) assigns the radial force and / or axial force to be detected to the guide rollers (242, 244, 246). The gripping device (100, 200) for measurement according to claim 5.

7. The detection device (300) of the gripping device (100, 200) for measurement detects the tensile force of the long member (12) gripped by the grippers (130, 230) of the gripping device (100, 200). The gripping device (100, 200) for measurement according to any one of claims 1 to 6.

8. The base body (110, 210) of the gripping device (100, 200) for measurement is further connected to a chain device (120, 220), and / or The gripping device (100, 200) for measurement includes at least one chain device (120, 122; 220, 222), and the base body (110, 210) is fixed to at least one chain device (120, 220). The detection device (300) of the gripping device (100, 200) for measurement detects an external force acting on at least one chain device (120, 122; 220, 222) in the conveying direction of the gripping device (100, 200) and / or in a direction perpendicular to the conveying direction of the gripping device (100, 200). The gripping device (100, 200) for measurement according to any one of claims 1 to 7.

9. At least one force detector (304) of the detection device (300) of the gripping device (100, 200) for measurement is attached to the chain device (120, 122; 220, 222). The first force detector (304) is disposed on the first link plate of the chain device (122, 222). The second force detector (304") is disposed on the second link plate of the chain device (122, 222), and the chain device (122, 222) has chain rollers. The gripping device (100, 200) for measurement according to claim 8.

10. The detection device (300) of the gripping device (100, 200) for measurement includes a timer. The detection device (300) captures, stores and / or transmits measurement data over time, The detection device (300) of the gripping device for measurement (100, 200) transmits a series of measurement data during the operation of the gripping device for measurement (100, 200) according to any one of claims 1 to 9.

11. The detection device (300) of the gripping device for measurement (100, 200) captures and / or The detection device (300) of the gripping device for measurement (100, 200) according to any one of claims 1 to 10 captures at least 4, at least 8, at least 12, at least 16 or at least 32 different measurement data in parallel.

12. The detection device (300) of the gripping device for measurement (100, 200) is a heat-resistant detector, The detection device (300) captures the measurement data of the stretching device (10) with an operating temperature reaching at least 200 °C, at least 300 °C or at least 400 °C during the operation of the gripping device for measurement (100, 200) according to any one of claims 1 to 11.

13. In the stretching device (10) comprising at least one gripping device for measurement (100, 200) according to any one of claims 1 to 12 and a guide rail (17) and constituting a lateral orienter, a machine direction orienter and / or a simultaneous stretching device, The gripping device for measurement (100, 200) is guided along the guide rail (17) by a guiding device (140, 240), which is a feature of the stretching device (10).

14. The stretching device (10) comprises at least one magnet (30) arranged in at least the region of the guide rail (17), The gripping device for measurement (100, 200) of the stretching device (10) according to claim 13 detects at least one magnetic field when passing through the magnet (30) on the guide rail (17).

15. The stretching device (10) comprises a receiver (430) arranged outside the stretching heating furnace (14), The receiver (430) receives measurement data from the gripping device for measurement (100, 200) of the stretching device (10) according to claim 13 or 14.

16. The stretching device (10) according to any one of claims 13 to 15, comprising a first gripping device for measuring for capturing measurement data of a first type and a second gripping device for measuring for capturing measurement data of a second type different from the measurement data of the first type.

17. The process of arranging at least one measuring gripping device (100, 200) according to any one of claims 1 to 12 on the guide rail (17) of the stretching device (10), The process of moving at least one measuring gripping device (100, 200) that selectively grips the long material (12) along the guide rail (17), The process of capturing measurement data by the measuring gripping device (100, 200), A method for capturing measurement data of a stretching device, comprising the process of storing and / or wirelessly transmitting the measurement data captured during and / or after the movement of the measuring gripping device (100, 200).

18. The process of assigning the measurement data captured at an appropriate position on the guide rail (17) of the stretching device (10), The method for capturing measurement data according to claim 17, comprising the process of controlling the stretching device (10) based on the captured measurement data.

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