DD132855B1 - ARRANGEMENT FOR THE SIDE EDGE CONTROL OF A TRACK, IN PARTICULAR TEXTILE FABRIC - Google Patents

Description

Field of application of the invention;

The invention relates to an arrangement for side edge control of a running 3ahn, in particular textlien fabric, by means of known sensing elements which influence via corresponding control elements associated with these actuators, which effect a mutual pressing or opening the guide rollers of the fabric guideways and thus correct a deviation of the fabric from the IJormallage.

Characteristic of the known technical solution

In the known device for the independent control of webs (DT-PS 1,026,272; 8 b, 4/06), the side edge control is carried out by the size of a forming vacuum, which acts on a arranged in a Ließraum membrane. Due to the different size of the vacuum, the membrane is moved, thereby changing the position of a mechanically mechanically connected nozzle to the jam openings.

In this arrangement, the general problem is that, especially when required for a fast-acting correction of the material edge movement, this edge control tends to oscillate or unstable works. Another shortcoming of these arrangements is the lack of means that allow immediate on the fabric guide a manual opening or turning off the review.

Object of the invention

The aim of the invention is to achieve a quick-acting edge correction with stable functional behavior of the side edge control and anytime possible manual opening or shutdown of the guide rollers directly on the respective web guide.

Explanation of the essence of the invention

In the known technical solution, the oscillation of the edge control is due to the fact that the size of the vacuum depends on the degree of coverage of a Tastdüse by the running fabric and the structure of the fabric and thus has a more or less large movement of the membrane result. Depending on the position of the nozzle, the oil jet emerging from the nozzle acts on a hydraulic cylinder. The latter is connected to a side edge control in connection, whereby a correction of the web is possible only in pendulum motion by the building on the hydraulic cylinder working pressure.

In order to avoid these disadvantages, the arrangement according to the invention for side edge control of a moving web, in particular a textile web, has edge-bending

groping elements that affect their associated actuators and thus correct positional deviations of the edge of the fabric, between the sensing element and the actuator for v / derconducting of coming from the Abtastelement control signal V / orler, an OR switching element and a Llengenverstärker in the main control circuit are arranged , The OR control element located in the main control circuit is associated with a pushbutton located in an auxiliary control circuit, preferably a manual pushbutton.

The vibrator is preferably an electropneumatic and the Mengenver3tärker and Handtaster a pneumatic element.

The side edge control according to the invention operates as follows, showing an electropneumatic control for a web edge side;

The deviation of a fabric edge from the hormone layer between two Stoffbahnfiihrern, for example, to the left, leads to the associated Stoffbahnfiihrer to cover the photoelectric sensing element and thus to trigger a control pulse in the sensing element. This amplified in the downstream switching amplifier control pulse (electrical binary signal) then passes to a eiektropneumatischen converter and is converted into a pneumatic discrete unit signal. To increase the air flow of the pneumatic-discrete unit signal, a pneumatic Llengenverstärker is provided.

The pneumatic signal at the V / andler causes an opening of the pilot control chamber in the volume booster in the above-mentioned Pail. The amplifier output is

released to the atmosphere and the generated by means of auxiliary air cascade pressure in the volume booster breaks down, that is, the pressure applied to the actuator via line air pressure also breaks down quickly and by the air escapes through this volume booster to Preie. The Leitrollenanspressung is thereby overridden, with the guide rollers adjust to gap and release the web edge · The opposite web guide can thus return the fabric back to its Uormallage.

In order to manually put the Leitrollenanpressung out of action, an auxiliary control circuit with a manual switch, which is in communication with the OR-switching element of the main control circuit, is provided. Upon actuation of the manual button, the air pressure applied to the actuator breaks down immediately, as the air escapes into the pre-heat via the volume booster. The described control also applies analogously to the fabric leader on the opposite web side.

In the puncture description of the side edge control, the edge scanning was done by photoelectric sensing elements and the conversion of the signal by means of an electropneumatic transducer. It is also possible to use other suitable scanning and control elements which operate, for example, mechanically or electromagnetically.

- 5 embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing, the switching scheme is shown for a fabric guide page.

The arrangement for side edge control consists of a photoelectric scanning element 1, preferably a V / echsellichtreflexschranke which scans the edge of the panel 2, the switching amplifier 3 "the electro-pneumatic converter 4" the OR-switching element 5 and the pneumatic quantity amplifier 6. These positions are located in Main control circuit 7- In the auxiliary control circuit 8 a standing with the OR-switching element 5 pneumatic hand switch 9 is arranged.

For actuating the guide rollers 10 of the fabric leader, a pneumatic actuator 11 is present.

The lateral edge control according to the invention operates as follows: The deviation of an edge of the fabric 2 from the normal position between two fabric guides, for example to the left, leads to the associated fabric guide for covering the photoelectric scanning element 1 and thus for triggering a control pulse. This pulse enters a downstream switching amplifier 3 and is passed as an amplified control pulse (electrical binary signal) to an electropneumatisehen converter 4. In this converter 4, the conversion of the electrical binary signal into a pneumatic-discrete unit signal.

To increase the air flow of the pneumatic-discrete signal, a pneumatic Uengenverstärker 6 is provided. The pneumatic signal on V / andler 4 causes in the above-mentioned case an opening of the pilot chamber in the! ', Lengenverstärker 6. The output of the

Amount amplifier 6 is released to the atmosphere and generated by means of auxiliary air iiaskadendruck in the volume booster б breaks down, that is, the pressure applied to the actuator 11 via the line 12 air pressure also breaks down quickly and together by the air through volume booster б escapes into the open · The Leitrollenanpressung is doing overridden, with the guide rollers 10 adjust to gap and the Xantenbereich the fabric 2 is released. The opposite web guide can thus return the fabric 2 back to its ITormallage.

To manually set the contact pressure of the guide rollers 10 out of puncture, a in the auxiliary control circuit θ with the OR-switching element 5 of the main st euerkreises 7 in conjunction standing handset 9 is provided.

Upon actuation of the manual switch 9, the pressure applied to the actuator 11 air pressure immediately collapses by the air escapes as described above via the volume booster 6 into the open and thus open the guide rollers.

Claims (4)

Invention sansprliche Arrangement for the lateral edge control of a moving web, in particular a textile web, in which the web edges are scanned by scanning elements which influence their associated actuators, which causes mutual pressing or opening of the guide rollers of the web guide and thus corrects a deviation of the web from the normal position, characterized in that between the sensing element (1) and the actuator (11) for forwarding of the sensing element (1) coming control signal, a transducer (4) »an OR switching element (5) and a quantity amplifier (6) in the main control circuit (7) are arranged and in the main control circuit (7) located OR switching element (5) in the auxiliary control circuit (8) arranged switch (9) is assigned » 2 · Arrangement according to item 1, characterized in that located in the auxiliary control circuit (S) button (9) a hand switch is · Arrangement according to items 1 and 2, characterized in that the quantity amplifier (6) and the manual push-button (9) are pneumatic working elements. 4 · arrangement according to item 1, characterized in that the transducer (4) is an electropneumatic element · For this 1 page drawings