WO2009033300A1 - Device for thermally cutting a running textile web - Google Patents

Abstract

In order to improve the quality of the cutting edge, particularly when the fabric thickness is changing, and to simplify the operation for the user, particularly when switching jobs, of a device for thermally cutting a running textile web made of meltable material, it is proposed to determine the target cutting temperature based on textile parameters in a controller (9) for the electrically heated severing units (1) that are typically powered by a commercial power supply unit (7) and are used for cutting the textile web (2) and to transmit it to the severing units (1) by means of a transmission device via contact rails (4). Each severing unit (1) has a dedicated temperature control device, by means of which the temperature can be controlled at the severing point in accordance with the specified target value, and a cutting wire (3) with a temperature-dependent electric resistor as the severing element. For this purpose, the current cutting temperature is determined and regulated based on the electric resistance of the cutting wire (3).

Description

 Device for thermal cutting of a running textile web

Technical area

The invention relates to a device for thermal cutting of a running textile web of meltable material, in particular a patterned textile web according to the preamble of claim 1.

State of the art

It is already known from WO 92/02246 A1 to subdivide a meltable textile web into webs by means of a thermal cutting device.

From WO 2004/070103 Al a cutting device for cutting a running, in particular patterned textile web of meltable material is known. It is proposed that the blade or wire-shaped cutting blade should be adjustable so that the interface on the cutting blade by means of a control device is selectable. Since, in addition, there is an increasing temperature range between the clamping points as compared with the middle range, a temperature adapted to the textile area can be selected. In particular, when using cutting wires, this design has not proven to be optimal. Furthermore, in WO 2004/070103 A1, a "V" -shaped cut is made possible by a temperature profile running asymmetrically to the textile web. This means that on the side - above or below - the textile web, the temperature is higher than on the opposite side. The fabric is melted wider on the warmer side resulting in the "V" shaped cut.

DE 195 10 818 C1 discloses a resistance-heated separating device for textile webs, which, however, requires a non-contact temperature sensor, which is designated there as advantageous, and which is electrically connected to a comparator. Such a solution has turned out to be disadvantageous. On the one hand, a temperature sensor is complex and maintenance-prone. On the other hand, the temperature sensor for the desired cutting device also brings disadvantages, resulting in with disturbing influences such as pollution and Ambient light - if an optical sensor is used - result. This should be avoided. The separation device known from WO 01/83872 A1 also has such a disadvantageous temperature sensor.

Presentation of the invention

The object of the invention is to improve an apparatus for thermally cutting a running textile web of meltable material. An important aspect of this object is to improve the quality of the cut edge of an electrically heated thermal cutting device, especially in the case of changing fabrics, e.g. Fabric thickness, improve. Another important aspect of this task is to simplify the operation by the user, especially when changing jobs. In particular, the need for an additional temperature sensor - e.g. a non-contact temperature sensor - be avoided.

The object is achieved by a device for thermal cutting according to claim 1. The measures of the invention initially have the consequence that the cutting device makes it possible in a special way to cut a textile web of different thicknesses into individual bands, in particular label bands, without additional temperature measurement. The solution to the problem comprises determining the optimum cutting temperature on the basis of textile parameters such as binding, fabric thickness, fabric material and the transport speed at the point of separation by the central control. This cutting temperature is transmitted to the electrically heated separation units as the setpoint. Each separation unit has its own temperature control and regulates the temperature at the point of separation according to the specified setpoint. As a result, differences between the separation units and external disturbances, in particular cooling by air currents at the cutting point are compensated. A consistent cut quality is achieved even with changing tissue properties.

Advantageously, the separation units are supplied via contact rails with electrical power. This eliminates both the complex up / down and Changing the cables for new orders and pattern changes as well as the cable variety in the different label widths. This results in better usability and a considerable time savings, which allows an even faster pattern or order change.

According to the present invention can be used as a supply for the cutting device, a commercial DC power supply, while according to the prior art in series connection of the separation units, a controlled power source must be used.

Essential to the invention is a control or regulation possibility of the separation units. When using a cutting wire as a separating element, the separation units each comprise a cutting wire with temperature-dependent electrical resistance. In this case, the current cutting temperature can be determined and / or regulated based on the electrical resistance of the cutting wire.

Advantageous embodiments of the inventive cutting device are described in claims 2 to 13.

It is particularly advantageous if contact rails are provided by means of which the separation units can be supplied with electrical power and control signals. This considerably simplifies the device. (Claim 2)

As already described above, it is an advantage of the invention that as a supply for the cutting device, a commercially available DC power supply can be used, while according to the prior art in series connection of the separation units, a controlled power source must be used. In an advantageous embodiment of the invention, this is so provided. (Claim 3) Alternatively, however, an AC power supply for supplying the separation units with electrical power can be provided (claim 4).

In an advantageous embodiment of the invention, the means for transmitting the desired cutting temperature to the electrically heated separation units Means for modulation of the target cutting temperature to the supply voltage (claim 5). Alternatively, however, for example, the contact rail additional poles for transmitting the target cutting temperature to the electrically heated separation units have (claim 6).

In order to be able to confirm disturbances, means for transmitting disturbance messages from the isolating units to the control device (ie the means for determining the target cutting temperature) are advantageously provided, which are then likewise implemented as modulation to the supply voltage or as separate poles on the contact rail (claims 6 and 7).

It is advantageous if the temperature control in the cold state can be calibrated, whereby cutting wire length differences and resulting resistance differences can be compensated (claim 9).

It is advantageous if the cutting wires are held in the upper or lower region of the separation units by means of a thermally conductive and electrically insulating material. As a result, the cutting wire heat is removed without the cutting wire is electrically short-circuited (claim 10). With this arrangement, it is possible to produce an asymmetric "V-shaped cut", optionally above or below, without having to accept the prior art nightles.

In order to prevent the system and / or the material to be cut from being damaged further after expressing a separating unit by the transported textile web from the holder, it is advantageous to provide an optical sensor for monitoring the position of the separating units, with which a separating unit can be expressed can be detected by the transported textile web from the holder. As a result, a signal for stopping the device can then be output (claim 11). Alternatively, however, a mechanical contact sensor for monitoring the position of the separation units may be provided (claim 12). In an alternative modification of the invention can be provided that the temperature control is carried out indirectly by means of current regulation or by regulating the e- lektrischen cutting performance of the separation units (claim 13).

The above-mentioned as well as the claimed and described in the following embodiments, according to the invention to be used elements are subject in their size, design, material usage and their technical conception no special conditions of exception, so that the well-known in the respective field of application selection criteria can apply without restriction.

Brief description of the drawings

Embodiments of the invention will be described by way of example with reference to the following drawings. Showing:

Figure 1 is an illustration of a separation unit to a preferred embodiment of the present invention, from the side;

Figure 2 is a schematic representation of the elements of the device to the embodiment of Figure 1;

FIG. 3 is a photographic representation of the separation unit according to FIG. 1; and

4 shows a photographic representation of a multiplicity of juxtaposed separating units according to FIGS. 1 and 3.

Ways to carry out the invention

In FIG. 1, a separation unit as a whole is denoted by 1. The separation unit 1 for severing a textile web 2 made of meltable material is equipped with a cutting wire 3. The cutting wire 3 is in the embodiment via contact rails 4 with electrical power - in the present embodiment with electrical DC voltage - supplied. The cutting wire 3 has a temperature-dependent electrical resistance. This is the current one Cutting temperature determined based on the electrical resistance of the cutting wire and adjustable. It is envisaged that the temperature control is calibrated in the cold state, whereby cutting wire length differences and resulting resistance differences are compensated. Through the use of contact rails 4 eliminates both a costly up / down and re-plugging the cables for new orders and pattern changes and the cable variety in the different label widths with the advantage of better usability and considerable time savings and the possibility of a very fast sample or Change of order.

FIG. 2 shows a multiplicity of separation units 1 from FIG. 1 next to one another. All of these separation units 1 are connected to the contact rail 4. The contact rail 4 is connected to a DC voltage source 7. These are in the present embodiment can be used to a commercial DC power supply. In an alternative embodiment, however, it is also possible to provide a commercially available AC voltage power supply unit for supplying the separation units with electrical power.

In the present exemplary embodiment, the setpoint temperature is determined by a control unit 9. On the one hand, this control unit 9 uses the information about the special textile materials of the woven material - for example the strength and melting temperature of the warp and weft threads, but also the binding and fabric thickness resulting from the sample program. It should be pointed out that the pattern program can also yield very different strengths and melting temperatures for the adjacent warp threads and also for the different weft threads, eg depending on the colors of the warp and weft threads. These values are known to the sample program and from this corresponding setpoint temperatures are determined. However, the setpoint temperatures also depend on the cutting speed of the translational transport of the fabric material at the interface. In the present exemplary embodiment, the data of the nominal cutting temperature determined by the control device are modulated onto the supply voltage by means of a transmission device 8 designed as a modulation device. In an alternative, not shown embodiment, the data are transmitted to the setpoint temperatures via additional poles on the contact rail to the electrically heated separation units.

In order to be able to confirm faults, the transmission device 8 is designed so that fault messages can also be transmitted from the separation units to the control device 9. These fault messages are also modulated onto the supply voltage as a modulation, in the present embodiment as a passive modulation according to the principle of load current modulation. However, all other conventional back-modulation methods can also be used. In the alternative, not shown here with the aid of additional poles on the contact rail 4 own poles are also provided for the fault messages. In the present exemplary embodiment, fault messages are generated by an optical sensor 6 for monitoring the position of the separation units 1. With the optical sensor 6, in particular, a printing of a separation unit 1 can be detected by the transported textile web 2 from the holder 5. Such a fault message of the optical sensor 6 is then transmitted via the modulation device 8 to the control unit 9, which can turn off the entire device to prevent further damage. In an alternative embodiment, not shown here, a mechanical contact sensor for monitoring the position of the separation units is used instead of the optical sensor 6.

In the present embodiment, the cutting wires 3 are clamped to cutting wire holders 10 made of thermally conductive and electrically insulating material. As a result, heat is removed from the cutting wire without the cutting wire being electrically short-circuited. This leads to an improved control behavior. In particular, with this arrangement it is possible to produce an asymmetric "V-shaped cut", optionally above or below. With the embodiment described above, it is possible in a special way, a textile web with varying thicknesses in individual bands, in particular Eti chain bands to cut. This comes into play, in particular, when different yarn strengths according to the label pattern are used in the production of the fabric. Because each separation unit 1 has its own temperature control and the temperature at the separation point can be regulated in accordance with the predetermined setpoint, differences between the separation units and external disturbances, in particular cooling by air flows at the cutting point can be compensated. It is thus achieved a consistent cut quality even with changing tissue.

In a further, alternative modification of the invention it can be provided that the temperature control is carried out indirectly by means of current regulation or by regulation of the electrical cutting performance of the separation units.

In the embodiment described above, reference is made to a fabric in each case. It will be apparent to those skilled in the art and is also apparent from the following claims that with each device described above according to the present invention, other types of Textilbah- nen, in particular knitted webs can be cut without departing from the invention.

LIST OF REFERENCE NUMBERS

1 separation unit with temperature control

2 textile web to be cut

3 cutting wire 4 contact rail

5 bracket

6 optical sensor

7 DC power supply

8 Transmitting device for transmitting the target cutting temperature and the fault message

9 control device

10 cutting wire holder

Claims

claims 1. A device for thermal cutting of a running textile web (2) made of meltable material, in particular a patterned textile web, with a plurality of electrically heated separating units (1) for cutting the textile web (2), wherein the separating units (1) in each case at least one separating element ( 3), Means for translational transport of the textile web (2) relative to the electrically heated separation units (1), the apparatus further comprising: Means (9) for determining the target cutting temperature for cutting a running, in particular patterned textile web (2) of meltable material, due to textile parameters such as binding, fabric thickness, fabric material, as well as the speed of said translational transport at the interface, Means (8) for transmitting the desired cutting temperature to the electrically heated separating units (1), each separating unit (1) having its own temperature regulating means, by means of which the temperature at the separating point can be regulated in accordance with the predetermined desired value, characterized in that the Separating units (1) comprise a cutting wire (3) with temperature-dependent electrical resistance as a separating element, wherein by means of the temperature control means the current cutting temperature can be determined and / or regulated based on the electrical resistance of the cutting wire (3). 2. Apparatus for thermal cutting according to claim 1, characterized by at least one contact rail (4), by means of which the separation units (1) can be supplied with electrical power and control signals. 3. A device for thermal cutting according to claim 1 or 2, characterized by a DC power supply (7) for supplying the separation units (1) with electrical power. 4. Apparatus for thermal cutting according to claim 1 or 2, characterized by an AC power supply (7) for supplying the separation units (1) with electrical power. 5. Device for thermal cutting according to one of claims 1 to 4, characterized in that means (8) for transmitting the target cutting temperature to the electrically heated separating units (1) comprise means for modulating the target cutting temperature to the supply voltage. 6. Device for thermal cutting according to one of claims 1 to 4, characterized in that the means (8) for transmitting the target cutting temperature to the electrically heated separating units (1) comprise additional poles on the contact rail (4). 7. A device for thermal cutting according to one of claims 1 to 6, characterized by means (8) for the transmission of fault messages from the separating units (1) to the means for determining the target cutting temperature (9). 8. Thermal cutting device according to claim 7, characterized in that the means (8) for the transmission of fault messages from the separating units (1) to the means (9) for determining the nominal cutting temperature comprise means for modulating the fault messages to the supply voltage. 9. A thermal cutting device according to any one of claims 1 to 8, characterized in that the temperature control means are calibrated in the cold state, whereby cutting wire length differences and resulting resistance differences can be compensated. 10. A device for thermal cutting according to one of claims 1 to 8, characterized in that the cutting wires (3) in the upper or lower region of the separation units (1) are held by means of a thermally conductive and electrically insulating material. 11. A device for thermal cutting according to one of claims 1 to 10, characterized by an optical sensor (6) for monitoring the position of the separation units (1), with a expressing a separation unit (1) by the transported textile web from a holder (5 ) detectable and from which a signal for stopping the device can be output. 12. A device for thermal cutting according to one of claims 1 to 10, characterized by a mechanical contact sensor for monitoring the position of the separation units (1), with a expression of a separation unit (1) by the transported textile web from a holder (5) is detectable and from which a signal for stopping the device can be output. 13. Device for thermal cutting according to one of claims 1 to 12, characterized in that the temperature control means are designed as current control means or means for controlling the electrical cutting performance of the separation units (1).