EP1394301A1 - Driving device for the blade-holder carriage in a double plush loom - Google Patents

Abstract

The slitting knife carriage is driven across the fabric width by a servomotor through an inelastic transmission, e.g. a toothed belt. The movement (B) is synchronized with the sley motion (C) but also allows for occasional movement beyond the fabric edge to a knife-sharpening position. The knife carriage motion is computer-controlled to limit the instantaneous velocity and acceleration (D) to mathematically normalized maxima. An Independent claim is also included for such a computer-controlled servomotor drive for the slitting knife carriage, the knife being fitted with a temperature sensor that provides a signal to initiate movement to a sharpening position and to a knife position adjustment position.

Description

The invention relates to a method and a device for controlling the Drive the cutting blade for the separation of a double pile fabric Double-file looms, wherein the drive movement of a servomotor over largely inelastic transmission elements (eg toothed belts) on the movable back and forth across the fabric width parallel to the edge of the fabric Knife carriage is transmitted with the cutting blade, the Servomotor by means of control computer the knife carriage after stored, accessible and modifiable drive programs given movement laws and the execution of the Drive programs synchronized to the rotation of the main shaft of the Double floats machine done.

From DE 195 36 002 is a drive device for the knife carriage for separating upper and lower fabric of a double carpet or double pile loom known. The knife carriage is driven by a drive cable driven, whose both ends a drive drum in spiral-shaped Wrap around grooves and finally at the end of these grooves with the Surface of the drum are firmly connected. This drive drum and so that the knife carriage by means of position-controlled, reversible Motor (servomotor) synchronous to the main shaft of the weaving machine driven.

The blade of the knife carriage moves in changing from tour to tour Directions over the range of tissue width with theoretically wanted constant speed. For regrinding the knife, the knife carriage outside the fabric width by means of additional stroke in the range of Grinder be performed.

There should be a limited period of time between two grinding operations which is not described further. The breaks between two grinding operations but should obviously be larger than a double stroke of Blade carriage.

The execution of the cutting process and the grinding process are about it not further described in this document. One goes however assume that the knife carriage between the two side edges of the Fabric driven at a predominantly constant speed becomes.

The knife carriage has - as is common practice (see DE 1 075 059, column 2, sentence 1) - completed its stroke before the sley strikes the shot or the shots of a shot pair of the tissue.
The disadvantages of this drive arrangement are that the drive cable for the knife carriage, due to the constantly changing and extreme load, subject to a longitudinal vibration, whereby the turning position can not be determined with sufficient accuracy.

Depending on the working speed of the weaving machine Strains of the drive cable of several decimeters, which, above all, and to irregular, disturbing in the turning areas of the knife carriage be effective. Incidentally, by this elastic drive cable no continuous cutting guaranteed.

It is not possible at the usual, high operating speed of the loom different turning positions with reasonably small over strokes to drive, so that you can reliably between the functions "cutting" and could distinguish "cutting with loops".

This ensures the most accurate possible control of the carriage stroke You can synchronize at this stage of development the drive of the knife carriage by the servo motor with the drive the main shaft of the weaving machine "electrically rigid" ("following error", max 1 °) coupled. Even that has not led to that one with the knife carriage reliable at normal working speed of the loom could approach two different turning positions.

It is impossible with this device, the frequency of a temporarily interrupted Grinding process in any way to make controllable. One does not reliably hit the intended grinding position with the knife carriage.

You bypassed the problem in practice by doing the grinding process permanently connected to the normal cutting process. At every cutting stroke a grinding process was still carried out. The cutting knife was processed very quickly by the frequent grinding operations. Nachstellvorgänge required a lot of time and the stoppage of the machine in the Changing time.

The life of the cutting blades was extremely low. In extreme Load cases had to be changed after every carpet the cutting knife become.

To remedy this deficiency and the maintenance of the knife carriage in increasing Measures in the automatable Arbeitsverrichtungen to take over was the subject of DE 100 04 904 C1 (corresponds to EP 1 122 348 A1). The Drive device was designed so that between the knife carriage and the unit encoders / distance scale (rotary encoder for position control and synchronization of the drive motor for the knife carriage) practically inelastic, positively inserted transfer elements (toothed belt; Spindle / nut or coupling) were inserted.

This embodiment allowed by the reduction of transmission errors already a certain differentiation of the strokes of the knife carriage for the cutting process with the periodic grinding on the one hand and for the cutting operation to be performed at a lower speed Adjustment process on the other.

For the differentiation of the Hubes between a pure cutting process and a cutting process however, the uncontrollable overstroke is still too high with grinding large.

Ensures a consistent, as low as possible cutting speed within the fabric at optimal turning process, then because of the still unavoidable accidental overstroke too often ground, so that the knife - as described above - unusable too fast becomes.

If, on the other hand, the acceleration or reduction in the turning phase is reduced Delay values, then increases at the same high engine speed Overtraining outside of the fabric and thus the cutting speed in the Tissue. The knife heats up too much. Melt pearls form the separate fiber ends. The quality of the pile becomes significant reduced. To avoid these shortcomings would then have the engine speed be reduced. This in turn leads to productivity losses.

In an effort to fathom and eliminate the cause of the faulty control and in particular the different errors of the turning positions in the area of the two fabric edges, gem. EP 1 217 115 A1 shifts the drive by the servo motor to where both strands of the traction means should ensure the same length and thus the same drive conditions.
Also, this measure did not bring the desired breakthrough in the solution ds problem. The different errors of the turning positions in the area of the two fabric edges occurred, although reduced, but still on. In addition, the servomotor was difficult to reach at the assigned position below the fabric. Replacing a timing belt was difficult. Again, this variant did not provide a thorough solution to the pending problem.

In view of the further increase in the operating speed of the loom - in particular of the modules directly involved in the weaving process, like shedding, gripper drive and weft stop - is you also strives to make the cutting process suitable for these high speed ranges to shape and thereby the grinding processes and the adjustment process For the cutting blades to make controllable and possible to automate.

It was also not possible, the textile technological concerns - the low Cutting speed - with the drive technology - the necessary Acceleration and thereby required mass of the engine and of the transmission link - to bring to a common denominator.

In the field of warp knitting there was in the Polgewirkeherstellung in the Past aspirations, through the use of other materials for the knives - z. B carbide or ceramic - to increase the service life, the To reduce grinding operations and to replace the cutting blades limit.

Taking into account the specified cycles between cutting operations and grinding operations on double-loom weaving machines and given the fact that an exact and clean cut here is the primacy above all others technical problems, have been in the past to double-file looms only steel knives with continuous, sufficiently high Hardness used and ground so often that getting a sharp knife was available.

The use of carbide knives or ceramic knives, in which the Time of blunting is not exactly determinable and the effect of a Re-sharpening due to the higher hardness can not be guaranteed on a regular basis can, has been rejected by the experts of weaving so far.

With DD 116 642 has been proposed, in analogy to a pole cutting device on a warp knitting machine also separating a double pile fabric or -wirirkes in the plane of the standing pole legs by means Hard rubber-bonded corundum discs according to the type of cut-off method make. The cutting device proposed for this purpose - or rather "cutting grinder" - showed at an endless Band-guided cut-off wheels, which at a smaller distance one after the other their cutting operation at low speed performed.

In practice, these cut-off wheels had an almost infinite lifetime. They did not need to be reground or otherwise be treated. As a disadvantage, however, it turned out that because of the relatively coarse structure of corundum particles at the time of this development were available, the severed fiber ends an irregular interface possessed. This kind of separating the pole handle therefore did not find the Approval of the specialists of the double-weaving mill.

The previous type of selection of cutting materials (steel knife), the Treatment of cutting blades by cyclically repeating grinding operations and the regular change of the knives therefore remained on the agenda. An execution of these Arbeitsverrichtungen in arbitrarily configurable cycles, at exactly determinable positions at high Working speeds remain an important goal.

In view of these conditions, the object of the present invention is to design the method for carrying out the cutting process so that cutting can be reliably achieved with a controllable, uniform quality of the surface even at the achievable high operating speed of the loom and the use of a servo drive for the knife carriage drive can be guaranteed and that also the maintenance operations for the cutting blade, namely the grinding, readjustment and u. U. the replacement of the cutting blade in optimizable, programmable cycles, can be performed largely automatically at predetermined positions.

The technical task is to secure a low maximum speed the cutting blade in the tissue as exact as possible Turning position of the knife carriage largely independent of the current high or low weaving machine speed and with low energy consumption to reach.

This task comes with surprisingly good results by the way the control of the cutting blade drive according to claim 1 achieved. By combining the special features of the drive program with the transmission link between servo motor and knife carriage, the has a relatively high natural frequency, conditions for created the knife carriage, where the dreaded longitudinal vibrations the knife carriage largely absent. The different ones Positions for occasional grinding and / or readjustments in the Turning areas are achieved with sufficiently high precision. The effort of electrical power is reduced by almost 30%.

From the combination

• einer niedrigen Maximalgeschwindigkeit über einen begrenzten Winkelbereich etwa in der Mitte des Gewebes ,
• einer bestimmten Größe einer Beschleunigungsrast,
• einem harmonischen Verlauf der Beschleunigung unter Beschränkung ihrer maximalen Größe und
• einer hohen Eigenfrequenz des Übertragungsgliedes

ergibt sich auf überraschende Weise ein Bewegungsverlauf des Messerschlittens, der in der Phase jedes Richtungswechsels des Messerschlittens auch bei hohen Arbeitsdrehzahlen ausreichend exakte Positionswerte für den Messerschlitten gewährleistet.

• a low maximum velocity over a limited angular range approximately in the middle of the tissue,
• a certain amount of acceleration pause,
• a harmonic course of acceleration with limitation of its maximum size and
• a high natural frequency of the transmission element

results in a surprising manner a movement course of the knife carriage, which ensures sufficiently accurate position values for the knife carriage in the phase of each change of direction of the knife carriage even at high operating speeds.

By avoiding shock and jerky accelerations is the Stimulating the self-oscillation of the system "Timing Belt - Knife Carriage" largely restricted. The higher natural vibration number of the transmission element (Timing belt - knife carriage) also reduces the Chance that the driving vibrations with the natural vibration superimpose and that it comes to resonance phenomena.

Adherence to a sufficient tolerance in the cutting speed is due to the relatively fast, but harmonious transition between a longer lasting, about the same speed (acceleration close to zero) and as quickly as possible and harmoniously changing Acceleration in the edge region of the fabric ensures.

The errors in the turning position are reduced so much that the maintenance operations can be controlled and automatically executed.

Regarding the use of the terms "normalized maximum acceleration" (F "(z)) and" normalized maximum speed "(F '(z)) is applied to the textbook "Transmission Technology" by Vollmer, Verlag Technik Berlin 1972, pages 358 to 368 referenced.

The specified values are u. a. with a curved shape "inclined sinoids" (after Besterhorn) or with a waveform "polynomial" (at least) 8. Potency attainable. For this compare with the one shown on page 367 Tables.

With the designated in claim 2 acceleration pause were the best Results achieved in the course of movement of the cutting blade.

The combination of the described work programs with additional Control programs for grinding and adjustment programs will be in front of everyone If necessary because of the quality of the used Knife these to ensure a high quality cutting surface must be subjected to regular grinding operations. That will be at the knives available today are always the case.

The embodiment according to claim 4 will offer where the speed of the Main shaft of the loom z. B. by the interaction with a Jacquard machine of larger dimensions within a revolution very has large deviations from a mean angular velocity.

Another solution variant to claim 4 results from the measures according to claim 5. Here is the synchronization between the knife carriage drive and the main shaft of the loom on very small Areas is limited in which the speed or angular velocity the main shaft averages near the range of medium speed emotional. In the remaining angular range, the drive is oriented for the Messsschlitten to control pulses, which have a consistent sequence and to ensure a constant speed.

The claim 6 describes a special form of said synchronization.

The embodiment according to claim 7 is based on the finding that the cutting quality, especially in the phase of the shot stop, too then not negatively affected when the cutting blade to this Time still moved within the tissue. The professionals on the Carpet weaving area has been subject to a prejudice in it was that the cutting blade during the shooting stop not cutting in the tissue allowed to move.

One assumed in this case significant errors in the cutting process. The The present invention has for the first time broken with this prejudice and the Proof of this provided with confirmatory test series.

The claim 7 builds on this knowledge and provides the knife carriage Motion cycles that are longer than one revolution of the machine. The remaining time to start another weaving machine tour can used to perform grinding operations or readjustments, before the start of the third or subsequent weaving machine tour the movement of the cutting blade in the opposite direction.

With this design, one is able to adjust the angular range of the acceleration detent reduce in the middle area of the tissue or in his settle at the lower angle range.

As already mentioned above, the end positions are due to the novel knife drive the knife carriage during the change of direction exactly definable. It is therefore appropriate, the drive programs for the knife carriage further program parts for grinding and adjustment assign and so designed work programs retrievable too to save. Claim 8 does not differ in this respect, in which Turning the grinding or adjusting device is activated.

in the embodiment according to claim 9, the blade carriage moves optionally by an additional amount along the path of the knife carriage - either in a separate grinding position or in a separate adjustment position.

Adapted to the respective cutting conditions - namely those of the Polbindungsart and the feed rate of warp thread groups dependent Poldens, according to claim 10 - it is recommended, work programs as well with regard to different types of pile bonding and / or pile densities, to subdivide and retrievable to save.

Claim 11 assumes that in addition to the grinding and adjustment programs and the Polbindungsarten or Pold density and the shape and the Material of cutting blades for the design of work programs of are crucial. One can also these conditions in separate exactly define callable work programs.

Further advantages with regard to the service life of the cutting blades can be achieved if, instead of empirical values, the temperature of the cutting blade is detected and, when certain limit values are reached, a renewed grinding process is activated according to claim 12. On the one hand, it is therefore possible to ensure the proper functioning of the cutting device even with different knife qualities and, on the other hand, it only needs to carry out a grinding process if it is recommended by blunting the knife. The life of the cutting blades is further increased.
The periods between the readjustment of the blades are significantly extended by the grinding in dependence on an actual blunting. The manual monitoring of the remaining, usable cutting area of the knife is made very difficult. It is therefore recommended according to claim 13, to monitor the path of the knife tip with a sensitive sensor and trigger the adjustment process when reaching a limit. If an adjustment process triggered by the sensors in a much shorter time than usual, then you should give a signal to stop the loom. Then no usable cutting area on the knife is more available. The knife must be replaced.

The device according to claim 14 assumes that the procedure with the automatic determination of necessary grinding operations and readjustments to give priority to. It defines the necessary Equipment of the device with encoders and control lines for activation the work items.

The embodiment of the adjusting device according to claim 15 has the advantage in that the clamping elements releasable during readjustment for the knife carriage not on stationary elements, but only on elements of the knife carriage support each other. This will be a burden of extreme sensitive guide for the knife carriage excluded.

Fig. 1

einen Querschnitt durch die Schneidzone mit einem teilweise geschnittenen Messerschlitten und einer geschnittenen Messerführung im Bereich einer Nachstellanordnung,

Fig. 2

eine schematische Darstellung des Messerschlittens seitlich außerhalb des Doppelflorgewebes in einer ersten Wendeposition bei alleinigem Schneidvorgang und einer zweiten Wendeposition im Bereich einer gestellfest angeordneten Schleifvorrichtung,

Fig. 3

einen Querschnitt durch eine Schleifvorrichtung etwa gemäß Fig. 2, die auch im Bereich der Wendeposition für einfache Schneidvorgänge angeordnet und aktivierbar sein kann,

Fig. 4

einen Weg-Zeit-Verlauf eines Messerschlittens im Vergleich zur Bewegung der Weblade im unteren Bereich des Diagrammes und dazu zeitlich überlagerte Beschleunigungs-Messwerte der Bewegung des Messerschlittens nach dem Stand der Technik und diesem wiederum überlagert die gesteuerte Beschleunigungsbahn nach der Erfindung,

Fig 5

einen schematisierten Weg-Zeit-Verlauf eines Messerschlittens, der insbesondere die Lage der unterschiedlichen Messerschlittenhübe bei einfachen Schneidvorgängen, bei Schneid- und Nachstellvorgängen demonstrieren soll,

Fig. 6

eine vereinfachte Darstellung des Verlaufes der Winkelgeschwindigkeit der Hauptwelle einer Doppelflorwebmaschine innerhalb jeder Webmaschinentour,

Fig. 7 a

einen vereinfachten Querschnitt durch eine zweitourig gewebte Doppelflorbindung mit asymmetrischer Poleinbindung,

Fig. 7 b

ein zwei- oder eintourig gewebtes Florgewebe mit symmetrischer Polhenkelanordnung,

Fig. 8 a

eine dreitourig gewebte Doppelflorbindung,

Fig. 8 b

eine dreitourig gewebte Doppelfloranordnung mit symmetrischer Poleinbindung,

Fig. 9 a

eine asymmetrische sechstourige Polbindung,

Fig. 9 b

die in Fig. 9 a gezeigte Bindung mit symmetrisch eingefügten Polhenkeln,

Fig. 10

eine erste Variante der Ausführung eines Schneidmessers mit symmetrischen Schneidflächen,

Fig. 11

ein Schneidmesser mit asymmetrischen Schneidflächen,

Fig. 12

ein Messer mit einem Besatz von Diamantkörnern,

Fig. 13

ein asymmetrisches Messer mit mehreren Schneidzähnen,

Fig. 14

eine schematische Darstellung der Steuerfunktion für den Antrieb des Messerschlittens bei den einzelnen Schneid- und Wartungsfunktionen und

Fig. 15

eine schematische Darstellung der Parameter zum Aufbau und zur Modifizierung der Antriebsprogramme für die Steuerung des Servomotors.

The invention will be explained in more detail below by exemplary embodiments. The accompanying drawings show:

Fig. 1

a cross section through the cutting zone with a partially cut blade carriage and a cut blade guide in the region of an adjuster assembly,

Fig. 2

a schematic representation of the knife carriage laterally outside of the double pile fabric in a first turning position in the sole cutting operation and a second turning position in the region of a frame fixedly arranged grinding device,

Fig. 3

a cross section through a grinding device as shown in FIG. 2, which can be arranged and activated in the turning position for simple cutting operations,

Fig. 4

a path-time course of a knife carriage compared to the movement of the batten in the lower part of the diagram and temporally superimposed acceleration measurements of the movement of the knife carriage according to the prior art and this in turn superimposed on the controlled acceleration lane according to the invention,

Fig. 5

a schematic path-time course of a knife carriage, which is intended in particular to demonstrate the position of the different knife carriage strokes in simple cutting operations, during cutting and readjustment processes,

Fig. 6

a simplified representation of the course of the angular velocity of the main shaft of a double-file weaving machine within each weaving machine tour,

Fig. 7 a

a simplified cross-section through a double-turn woven double-pile weave with asymmetric pole weave,

Fig. 7b

a two- or one-turn woven pile fabric with a symmetrical pile loop arrangement,

Fig. 8 a

a three-way woven double-pile weave,

Fig. 8 b

a three-door woven double pile arrangement with symmetrical pole binding,

Fig. 9 a

an asymmetric six -stoured pile weave,

Fig. 9b

the binding shown in Fig. 9 a with symmetrically inserted pole loops,

Fig. 10

a first variant of the embodiment of a cutting blade with symmetrical cutting surfaces,

Fig. 11

a cutting knife with asymmetrical cutting surfaces,

Fig. 12

a knife with a garnish of diamond grains,

Fig. 13

an asymmetrical knife with several cutting teeth,

Fig. 14

a schematic representation of the control function for the drive of the blade carriage in the individual cutting and maintenance functions and

Fig. 15

a schematic representation of the parameters for the construction and modification of the drive programs for the control of the servomotor.

In Fig. 1 is a partially sectioned side view of a knife carriage 1 shown in its functional position. The knife carriage 1 is positively guided on a guide rail 2. To reduce the friction and the Wear of the sliding surfaces are either the guide surfaces of the blade carriage 1 or the sliding surfaces of the guide rail 2 with sliding linings 21, 21 '- preferably made of plastic - provided.

In the cutting zone facing portion of the blade carriage 1 is on the main body 12 of the knife carriage leash clamping surface for the cutting blade 11 provided. The cutting blade 11 is by means of clamping lever 13, the pivotably mounted on the bearing 134 of the knife carriage 1 and with a movable clamping plate 131 is fitted, against the clamping surface on Base body 12 of the knife carriage 1 pressed.

The pressing force of the clamping plate 12 is generated by a spring 133. to Relaxation of the knife 11 during readjustments becomes the cocking lever 13 by means of lifting spindle 14 against the biased spring 133 moves. For the appropriate balance between the pivoting movement of the clamping lever 13 and the stable position of the perpendicular thereto aligned lifting spindle 14th a ball joint 132 is provided. The lifting spindle 14, the axially immovable is guided on the base body 12 of the knife carriage 1, has at her Base a gear 141, which in a limited range of motion of Knife carriage 1 with a fixed to the guide rail 2, fixed to the frame Rack 22 meshes. This rack 22 is located in front of Adjustment position and is effective when the knife carriage 1 in the and moved from the adjustment position.

The gear 141 issued rotational movement of the lifting spindle 14 leads to a Lifting the clamping lever 13, d. H. the clamping plate 131 with the clamping pin 1311 is lifted from the shank of the knife 11.

As soon as the clamping force reduces, push through the bias the spring 151 loaded pressure pin 15, the cutting blade 11 against a Not shown stop in the cutting plane in the new cutting position. Moves the knife carriage 1 from the readjustment position the turn of the knife carriage 1 back, the lift spindle 14 is the clamping lever 13 free again. The pressing force of the spring 133 fixes the cutting blade 11 sufficiently safe.

The double-pile fabric 4, which is in the area of the two basic goods with each other connecting pole legs into two separate pile fabrics 41, 42 or Carpet fabric is to be separated, is near the cutting zone through preferably fixed to the frame guides guided so that the pole legs be separated as desired at equal distances to the base tissues.

This described blade carriage 1 is during the normal cutting process with the help of a toothed belt 16, fixed with the knife carriage 1 connected, moving at a speed that reaches a certain maximum should not exceed.

The knife carriage 1 moves in its normal stroke h so between two turning areas that the cutting blade 11 outside of Tissue 4 finally realized his change of direction. Such Position is shown in Fig. 2 by the left knife carriage 1.

On the knife carriage 1 is located near the cutting edge of the knife 11 a temperature sensor 56. This sensor 56 is via an evaluation unit 562 and a transmitter 561 connected to the control unit of the loom. Indicates a temperature increase on the cutting blade 11 to a blunt and subsequently upon heating of the blade 11, the Knife carriage 1 immediately or in one of the next tours in one around the Overlift U1 moved further outward position 1 '. The cutting knife 11 'reaches the area of grinding bodies 31, 32 on the way there a grinding device 3.

After the grinding process is done after the change of direction of the knife carriage 1 ', the grinding edge again directed by the puller 32, so that a flat, burr-free cutting edge for the following cutting process available stands.

In Fig. 3 is another device for activating the grinding process shown. The abrasive body 31 and the puller 32 are here in a perpendicular held to the trajectory of the knife tip movable carrier 33 and guided. The guide 33 for the carrier 311 is located between the fabric edge 43 and the turning position of the knife carriage 1 during the normal cutting process (stroke h).

On the support 311 also the puller 32 is pivotally mounted and is pressed laterally from the grinding body 31 elastically on the upper edge of the knife. This puller 32 is mounted for this purpose on a peel-off lever 321. A spring 314 provides the necessary frictional connection of the puller 32 to the knife 11 ago.

The carrier 311 is slidably mounted on a frame-fixed guide 33. about a positioning cylinder 315, this carrier 311 from the path of the cutting blade 11 out and back in again. The control valve 316 initiates this switching movement. The control valve 316 is in more convenient Way activated by the control device of the weaving machine.

In Fig. 5, the principle of the arrangement of the grinding devices 3 and the Adjustment device 6 in conjunction with different stroke sizes h, h1, h1 ', h2 of the knife carriage 1 shown.

The knife carriage 1 moves during the normal cutting process with a stroke size h beyond the fabric width 44 on both sides and leads essentially only its final reverse movement outside the tissue out. If the requirement of a grinding process is found, receives the servomotor driving the knife carriage 1 through the work program of the control computer the command, an additional movement by one Overlapping U1 or U1 'or to execute a total stroke h1 or h1'. The As described, the cutting blade becomes during an overstroke U1 or U1 'or both overruns U1 and U1' reground.

Due to the repetitive grinding operations, the front edge of the Cutting knife 11 processed gradually. Is by a sensor 57 or by controlling the weaver a wear of a similar magnitude found, receives the drive device for the knife carriage. 1 an additional signal. A new drive program is activated, whereby the knife carriage 1 - possibly at reduced weaving machine speed or in a cutting break - in a further outward adjustment position is brought into the region of the adjusting device 6.

The clamping of the blade 11 on the knife carriage 1 is thereby released and Pressure pin 15 push the blade 11 in a corrected position. To completing the adjustment and re-clamping the knife 11 on the knife carriage, the knife carriage is back to normal Work program driven by the knife stroke h.

During a knife stroke h, the drive of the knife carriage 1 in moved a predetermined ratio to the rotational movement of the loom. We call this process synchronization.

During a double knife stroke (back and forth) is subject to the movement the knife carriage 1 a number of disturbing influences. one This disturbing influences is shown in Fig. 6. In particular by the Jacquard machine of a double carpet loom or plush loom The speed of the weaving machine is within a weaving machine revolution with respect to its angular velocity ω (FIG. 6) affected. The angular velocity ω varies by orders of magnitude ± 10 to 15%.

If the drive of the blade carriage 1 - as usual - on the principle the "rigid wave" is synchronized with the rotation of the main shaft, The drive for the knife carriage follows the different angular velocity ω of the main shaft of the loom. The servomotor transfers on the knife carriage 1 constantly changing accelerations more or less great intensity.

At previously customary weaving the drive of the knife carriage was 1 in practice exclusively by special ropes of smaller cross-section. These special ropes are in spite of high load capacity in the longitudinal direction of their axis elastic, so that these ropes together with the knife carriage 1 with a so-called "mass-spring system" are to be compared. Will this "mass-spring system" vibrated by a forced movement, so it vibrates with considerable energy with a certain, calculable own frequency, the so-called natural vibration frequency.

In Fig. 4, the effect of these influences of the forced pulses is the main shaft of the loom and its superposition with the vibrations of the "mass-spring system" shown. The thin black line A shows the respectively measured, current acceleration values of the knife carriage 1 of a prior art embodiment using a drive cable, which was driven by a servo motor. In the present Case was this measurement - on a double carpet weaving machine with a working width of over 4 m - at about 166 weaving machine revolutions per minute.

To illustrate the synchronization is in the diagram of Fig. 4 with the Line B, the stroke of the knife carriage 1 and in synchronism with the line C. the path-time history of the batten is entered. In the horizontal direction is in this diagram as a scale the time or the angle of rotation γ of the main shaft applied.

One revolution T (γ = 360 °) of the loom main shaft is by two limited successive firing stops the sley C. The scale the path-time course of the movement of the batten C and the knife carriage B is in the vertical direction through the path "s" on the inner scale plotted below starting at "0".

The scale for acceleration "b" is on the left, outer, vertical Scale applied. The zero position is located approximately in the middle. The measured acceleration values of the line A of the knife carriage 1 - after the execution of the prior art - repeat themselves with low Differences after every two revolutions, namely after a double stroke of the knife carriage 1.

In the phase where the knife carriage 1 its upper position approximately at s = 4.5 reached, sets according to track A, the braking action of the blade carriage 1, which is characterized by a negative acceleration peak. In the Turning phase of the knife carriage 1 is the acceleration near zero to Immediately increase again and the knife carriage in the opposite direction Speed set direction.

When the knife carriage reaches the other end of the fabric 4, settle first an extreme acceleration in the sense of a delay. It creates a Tension peak, triggered by the extreme retardation of the knife carriage, immediately before the next (lower) movement reversal. Also in this reversal of motion drops the acceleration to a very low level Value, apparently with the aim of the knife carriage in the reverse phase calm.

Immediately afterwards, we recognize a second acceleration peak, which is the Knife carriage accelerated again in the opposite direction.

These oscillations of the acceleration curve are described in the Areas essentially forced oscillations, which for the changing Movement of the blade carriage 1 are necessary.

Between these two acceleration peak pairs in the area of Turning points of the knife carriage, we recognize a variety of irregular Accelerating tips of smaller dimensions. The majority of these Acceleration peaks is caused by the natural vibration described of the "mass-spring system", which are also superimposed by the loads on the main shaft of two eccentric shaft revolutions.

In the left-drawn tour T1, in which the knife carriage after moved "down", the irregularities are different and less intense than in the following tour T2, in which the knife carriage moves "up". The difference results from the different superimposition of the forced ones Movement of the knife drive over the same always directed, forced oscillations of the main shaft of the loom and also from the ever-changing length of each pulling Trums of the special rope.

These different acceleration peaks ultimately result in that the knife carriage both within the fabric and outside the same in the turning phase, due to the elasticity of the drive cable, performs very different movements and especially in the Wendephasen takes very different positions.

To eliminate these extremely irregular acceleration peaks on the Knife carriage provides the invention in a first step, between the Drive for the knife carriage, namely the servo motor, and the knife carriage 1 itself a particular transfer element - in the present case it is a toothed belt 16 - use (see Figures 1 and 2). This timing belt 16 has a multiplicity of stretched endless wires and because of it Function a very low elongation and, accordingly, a clear higher natural vibration number.

The timing belt 16 follows the predetermined movement because of its low Elasticity and its high natural vibration number by the drives forced oscillations pretty much when accelerated by accelerations forces have a harmonious course and in their Size are limited.

The second essential measure of the invention is the design the laws of motion of the knife carriage with the limitation of normalized maximum speed and with the limitation of normalized maximum acceleration in conjunction with a harmonic acceleration curve, which is shown with the web D (thick solid line in Fig. 4).

A significant contribution to the design of these optimal laws of motion also performs the dimensioning (limitation) of the acceleration stop (γ1, γ2), where the cutting blade 11 in the middle region of the tissue 4 moves with constant normalized maximum speed.

In this phase of the acceleration rest γ1, γ2 moves the knife carriage 1 with normalized constant speed of maximum 1.4. at the use of a modified waveform, e.g. B. a polynomial higher order, can also with normalized maximum speeds to be worked by less than 1.17. This normalized speed is much lower than that in previous drives for the Cutting blades were used (eg 1.78). It guarantees a high Cutting quality for the Floroberfäche.

The acceleration catch extends in terms of angular units (main shaft) between 30 ° and 120 ° - but preferably between 80 ° and 95 degrees. In the acceleration pause γ1, γ2, tolerances of up to 10%, however preferably up to 5% is considered appropriate.

From the acceleration rest γ1 the knife carriage 1 then moves jerk-free and bum-free at first until the turning point and then just as jerky and bumpless until the next acceleration stop γ2. The maximum of Acceleration b - lane D - becomes at the apex of the blade carriage movement reached.

Consciously, however, it is avoided that during the turning point a clear Acceleration change takes place because such an irregular Knife carriage movement in the phase of change of direction could lead. Nevertheless, a certain amount of swinging is not possible, because the change of the guidance and clutch conditions still remains still unfavorable effect. These vibrations with the natural frequency of However, mass-spring system affect neither the grinding nor the Adjustment process.

At a normalized acceleration up to + 6 or - 6 is using a harmonic Acceleration curve D, as shown in Figure 4, one more quiet turning phase guaranteed. For a waveform "polynomial with 9. Potency "will have a maximum normalized acceleration of less than 4.9 possible.

The designation of the normalized speed and velocity mentioned here Acceleration values occur z. B. based on the theoretical Treatises by Volmer in the textbook "Getriebetechnik", VEB Verlag Technik, Berlin, 2nd edition, 1972, pages 358-367.

This drive design allows almost vibration-free movements the knife carriage 1 are ensured during the turning phases. This is especially true of the weaving machines, where the angular velocity ω varies only slightly during each revolution.

On weaving machines with a mostly very heavy jacquard machine are equipped, the changing angular velocities ω are very serious and disturb the optimized design of the laws of motion of the In this case it is advisable to check the differences between the To detect angular velocities ω on the main shaft and by means of correction programs add to the drive program for the knife carriage 1, so that at normal drive speed of the loom, the front described optimal motion sequences with a reasonable precision can be guaranteed.

The same result is the result of the synchonisation between the drive of the knife carriage and the main shaft of the loom performed only in a limited angular range of the main shaft and in the remaining area between two synchronization phases of Knife carriage 1 by control signals, the average speed of the Simulate main shaft, move further.

As appropriate, the synchronization has in the phase of weft stop proved. One should note, however, that the knife carriage There does not come to a halt and that at this stage a great harmonious running acceleration is effective.

Using the example of a double carpet weaving machine for producing a fabric 4 with a fabric width 44 of about 4 meters results in using the above parameters and adhering to the previously established normalized maximum speed of 1.36 at 180 rev / min maximum acceleration on the knife carriage 1 of measured 275 m / s ² . Comparable values for previous drives are between 550 m / s ² and 660 m / s ² at 166 rpm.

• wenn die Drehwinkelgesch windigkeitsdifferenzen der Hauptwelle in vertretbaren Grenzen vorliegen,
• wenn die Drehwinkelgeschwindigkeitsdifferenzen innerhalb eines Messerschlitten-Doppelhubes durch Korrekturprogramme ausgeglichen sind oder
• wenn die Drehwinkelgeschwindigkeitsdifferenzen der Hauptwelle durch Unterbrechung der Synchronisation vom Messerschlittenantrieb abgekoppelt werden.

In addition, we can conclude that the absolute maximum accelerations in the design of the drive programs according to the invention are almost the same regardless of the direction of movement of the blade carriage 1 in both end positions. That's right

• if the Drehwinkelgesch windigkeitsdifferenzen the main shaft are within reasonable limits,
• when the rotational angular velocity differences within a knife carriage double stroke are compensated by correction programs or
• when the rotational angular velocity differences of the main shaft are disconnected by interrupting the synchronization of the knife carriage drive.

In addition to the optimization of the pure drive process for the knife carriage play for the cutting processes, for the grinding processes of the knife 11 and for the execution of readjustments for the knife still others Conditions of weaving a crucial role.

An essential parameter for the design of this process is the type the pile weave. Here, it is particularly important that the cutting, Grinding and adjustment program for the pile density and possibly the pile material adapt. To determine the pole density plays the choice of the pile bond a crucial role. Also important is whether an asymmetric or a symmetrical binding is worked. For a symmetrical bond Regularly changing pile threads change from the upper to the lower fabric (41, 42) and almost simultaneously pile threads from the lower to the upper fabric (42, 41).

In Figs. 7a and 7b to 9a and 9b, some examples are given Bonds as asymmetric bonds (FIGS. 7a, 8a and 9a) and symmetrical bonds (Fig. 7b, Fig. 8b and Fig. 9b) shown. We can clearly recognize the different densities of the pole handles, the one essential parameter for the blade life can be.

In addition to these bond-dependent pole densities, it is additionally possible by the provision or stripping of a particular warp length per Time unit, the density in the warp direction in addition to vary. These too Conditions should be considered when designing the cutting, grinding and adjusting process Consideration.

FIGS. 10 to 13 show different blade shapes 11 a, 11, 11 b, 11c shown. These different knife shapes 11a, 11, 11b, 11c may also have a significant impact on the design of the cutting, Have grinding and adjusting processes with regard to their time sequence.

The symmetrical blade shape 11a shown in FIG. 10 makes it necessary always perform the grinding process symmetrically from both sides. Thereby However, the life of the knife is relative to others Cutting edges somewhat limited, because you do not between when grinding can distinguish a grinding and a peeling process.

The knife shape 11d of FIG. 11 has over the Fig. 10 has the advantage of asymmetrical cutting shape. The abrasive is always the oblique Cutting surface assigned while peeling always on the plane Top of knife 11d done.

The knife 11b shown in Fig. 12 is in the cutting area with a Variety of smallest corundum or diamond grains occupied in a plastic, Hard rubber or metal body lower hardness are inserted. These Knives 11b separate the pole legs similar to the separation-grinding method, by scratching the fiber surfaces. These are then replaced by a Tension separated. With such knife forms will be a regrinding usually unnecessary. Become these hard abrasive grains in a limited flexible material involved, can with a very high Service life of the knife calculated without grinding and readjustments become. In this case, there is the advantage of Antiebsgestaltung invention for the knife carriage 1 especially at the right speed of the knife and saving on drive power.

Another variant of the knife forms 11c is shown in FIG. This Knife 11c is equipped with three cutting tips, of which the middle one Cutting tip by the distance a further protrudes than the laterally adjacent Pinches. With this design, it is possible at relatively low Cutting speeds to achieve a greater depth of cut per knife stroke. This version is especially well suited when a hub h of the knife carriage 1 over more than one weaving machine revolution T extends. In each direction of movement of the blade carriage 1 are two in each case Knife tips effective.

Instead of the sharp knife shape of FIG. 13 can also arcuate Knife (similar to 11b) can be used. Be corundum or diamond staff Knife used, the first tip is used to scoring the fibers while the following tip provides the appropriate traction.

The two-part structure of the blade 11c in Fig. 13 has a special one Purpose. If ceramic is used as the cutting material, then the shaft must 110 of the blade made of bendable steel or the like. So that the Deformation during clamping does not lead to breakage of the brittle ceramic can lead.

In Fig. 14 is again the process of cutting, cutting and Grinding and cutting presented with readjustments. Is the Machine set to normal operation, then takes over the control segment 54 of the control computer 5, the control of said process. For the Determination of the output data are via the input 51 in the evaluation unit 53 guide data or parameters for the selected binding, for the selected Pold density, the pile material and possibly the selected knife material or the selected knife shape. From this data is a developed a basic program that the control segment 54 for the Normal operation is supplied.

The process of cutting begins with the drive of the knife carriage 1 from one normal turning position to the other with a stroke h. That with a heat sensor 56 equipped cutting blade 11 shows when exceeded a certain limit of the temperature that its Cutting are dull and heat too much. The evaluation unit 562 determines this limit and outputs a signal via a transmitter 561, in the control segment 54 activates a work program in which the knife carriage 1 z. B. moved to a grinding position knife stroke h1 or h1 '. If the cutting blade 11 sharp again, its temperature drops below Exposure of the cooling air in the turning phases quickly and it will over no grinding operations are carried out for a limited period of time.

If one sets with a sensor 57 z. B. determines that the above knife length is too low to make a neat cut, gives an evaluation unit 571 information to the control unit 54. This dissolves Adjustment of the knife. For this purpose, the knife stroke h is a larger Overlift U2 (Fig. 5) increased to h2, so that the knife carriage in a Adjustment position in the area of the adjuster 6 passes.

In the adjuster 6, the clamping of the blade 11 is released and the cutting blade 11 - as described with reference to FIG. 1 - readjusted. If the knife 11 is clamped again, the normal operation with a Schneidmesserhub the size h continued.

If the sensor immediately sets a knife position in the limit area during this phase firmly, the weaving machine receives a stop signal. On the display will the need for a knife change is displayed.

In the event that on the machine or on the devices to wait the cutting blade has been manually corrected error i. d. R. via the switch 52 of the creeper or jogging mode activated. In this Phase is the drive of the knife carriage 1 with the rotational movement of the Main shaft of the loom regular according to the principle of "rigid electric shaft "is synchronized. A correction of the cutting movement is in not required in this case.

In addition to the mentioned type of programming of the control for the servomotor and activating the grinding or adjusting processes of FIG. 14 a second procedure possible. This procedure is based on of the scheme of FIG. 15.

In a memory of the control computer parameters of Polbindungen, the polar density, the pole material and the materials of the knife and the Form of the knife stored, which are used in the usual way. The operator can manually or automatically - certain preference rows following - the individual parameters for modifying a work program provide.

The work program then determines from the selected parameters based on experience or with the help of expert systems the necessary grinding sequence, the Nachstellfolge and the cycles to stop the Machine for the purpose of blade change.

• zunächst die Zahl der gleichzeitig eingetragenen Schüsse,
• die Zahl der Webmaschinentouren zur Herstellung eines Polschenkelpaares und
• die Art und Weise der Polbindung für Ordnungszwecke

berücksichtigt.For the parameters of the pile binding, it is recommended to make an outline that

• first the number of shots taken at the same time,
• the number of weaving machine tours for the production of a pair of poles and
• the way of poling for regulatory purposes

considered.

The manner of pile bonding can be asymmetric. Such bonds are shown in Figures 7a, 8a and 9a. But the type of binding can be also be symmetrical. Such bonds are shown in Figures 7b, 8b and 9b shown.

We find the two-shot one-way binding according to the first line for example, in Fig. 7b. A zweischüssig two-way woven asymmetrical Binding we see in Fig. 7a. The zweischüssig three-way binding we find in Figures 8a and 8b, where 8a is the asymmetric and 8b the shows symmetrical bond.

The pile density is reported separately with respect to the density in the warp direction (1st column) or the density in the weft direction (2nd column). Be given here the number of pole pieces per centimeter. A pole handle exists regularly from two pole pieces.

The third group of parameters includes the pile material. Here are just three examples, namely wool, polypropylene PP or polyacrylonitrile PAN. This pile material can be subdivided by the thread thickness (denier) become.

The fourth and the fifth parameter group refer to the material of the Cutting knife 11 or its shape. As a material of the knife can expedient manner steel, carbide or ceramic can be used. These materials form sharp dimensionally stable and nachschleiffähige Cut out.

The material group, which at its cutting surface with Korundkörnern or with Diamonds is occupied, may have different binders, namely Plastics, hard rubber or metal. In this case, the cutting edge of the Knife 11b predominantly by protruding surfaces of corundum or Diamond grains formed, which enclosed with its rear part of the binder and kept. The cutting process is similar in this case a Trennschleifvorgang.

The sharp-edged corundum or diamond grains scratch the fibers of the pile material so that they when separating the upper and the lower fabric or detach from each other during special clamping operations. The advantage This latter knife materials consists in a very long life. This sanding operations are extremely rare. at A grinding process, the effective on the surface corundum or Diamond particles knocked out so that after working off the enclosing Binder a new group of sharp-edged corundum or Diamond splinter is effective.

The distinction of the knife according to their shape is first after the Number of consecutive tips or bows. A knife with one The top figures show us 10 to 12. While a knife with two points (effective peaks) is shown in FIG. Symmetrical or asymmetrical Pointed or symmetrical and asymmetrical arcs are in the Figures 10 and 11 shown.

The first group of parameters of the poles can be the operator of the loom depending on the specifications for the quality of the carpet in terms of pile binding, pile density and Polmateria! via an input unit 51 pretend.

The parameters for the material and shape of the knife depend on the available tools. You can the control computer 5 to the combination assign certain preference rows to this parameter. The calculator is with it able to u. To replace missing parameters. From the determined Combinations, the control computer - also based on experience - the frequency of the grinding process and the frequency of readjustments determine. In the same way, the computer can output stop signals, the connected with the request to change blades.

The specified parameters and grinding and readjustment cycles are in this Listing given by way of example only, the example showing the tendency and does not reflect the true mapping of the parameters to the control commands.

LIST OF REFERENCE NUMBERS

1, 1 '

blade slide

11, 11 '

Cutting knife, general

11a, 11b, 11c

Cutting knife, variants

110

clamping section

113

Corundum / diamond grains

12

body

121

guide

13

clamping lever

131, 131 '

clamp

1311

clamping pins

132

ball joint

133

feather

134

camp

14

lift spindle

141

gear

15

pushpin

151

feather

13/14/15

readjustment

16

toothed belt

2

guide rail

21, 21 '

sliding coatings

22

rack

3, 3 '

grinding device

31

abrasives

311

carrier

312 ??

guide

313 ??

camp

314

feather

315

actuating cylinder

316

Control valve

32

puller

321

draw-out

33

guide body

4

double-pile

41

pile fabric

42

pile fabric

43, 43 '

selvedge

44

fabric width

5

control unit

51

input unit

52

Switch / Mode

53

Storage

54

Control area / normal operation

541

- Control - cutting

542

- Control - cutting / grinding

543

- Control - cutting / readjusting

55

Control area / creeper - inching operation

56, 56 '

Encoder / temperature, cutting blade

561, 561 '

transmitter

562, 562 '

evaluation

57

Giver / track of the knife tip

571

Evaluation unit / readjustment

572

Evaluation unit / Stop

6

adjusting

A

Acceleration time course on the knife carriage - measured prior art

B

Path-time course of the knife carriage

C

Path-time course of the batten

D

Acceleration time course - drive program according to the invention

a

distance

H

Knife stroke / cutting

h1, h1 '

Knife stroke / cutting + grinding

h2

Knife stroke / readjustment

U1

Overstroke / grinding

U2

Overstroke / readjustment

S

path

t

Time

γ

Angle of rotation of the main shaft

γ1

Angle of rotation range, acceleration locking section

γ2

Angle of rotation range, acceleration locking section

ω

Angular velocity of the main shaft

P1 ... P6

pile loops

T, T1, T2

Tour (360 ° rotation of the main shaft)

Claims (15)

Method for controlling the drive of the cutting knife for separating a double pile fabric (4) on double pile looms,
wherein the drive movement of a servomotor is transmitted via inelastic transfer elements (eg toothed belt 16) to the knife carriage (1) which moves back and forth at least over the fabric width (44) parallel to the fabric stop edge and carries the cutting knife (11),
wherein the cutting blade (11) in at least one turning area monitoring, grinding and / or adjusting devices are assigned,
wherein the servo motor by means of control computer (5) grants movement to the knife carriage (1) in accordance with predetermined laws of motion according to stored, retrievable, modifiable drive programs extending over at least one weaving machine tour,
wherein the drive programs are designed to give the cutting knife (11) a velocity range in the tissue (4) in a tolerance range and a jerk and bum-free acceleration curve for the reversal of movement,
wherein the speed profile over an angular range of the main shaft between 30 ° and 120 ° is almost constant and the normalized maximum speed (F '(z)) of ± 1.4 is not exceeded, and
where the normalized maximum acceleration (F "(z)) is less than ± 6. A method according to claim 1, characterized in that the maximum speed of the knife carriage (1) over an angular range of the main shaft in the middle of the fabric between 75 ° and 95 ° with a tolerance range of max. 5% is constant. A method according to claim 1 or 2, characterized in that at least one additional Steuerprogamm for optional activation of a grinding and / or Nachstellprogrammes for the cutting blade (11) is provided. Method according to one of claims 1 to 3,
characterized in that the drive program program parts for correcting the angular velocity of the servomotor for the cutting blade drive for the predominant compensation of cyclic speed fluctuations of the main shaft of the loom are assigned. A method according to claim 1, characterized in that the synchronization of the cutting blade drive with the main shaft of the loom within one or more weaving machine tours only in one or more predetermined, limited angular range (s) on the principle of "rigid electric wave" takes place and in the other areas is controlled according to an average angular velocity of the main shaft. A method according to claim 5, characterized in that the synchronization of the cutting blade drive with the main shaft of the loom within one or more weaving machine cycles takes place exclusively in the phase of a weft stop. A method according to claim 1, characterized in that the drive program - for a single Schneidmesserhub over a fabric width - extends over a rotation angle of the main shaft of the double pile loom, which is larger than the rotation angle of the main shaft between two but smaller than the rotation angle between three or more weft stops and that the additional control program parts for optional activation of grinding or adjustment programs between the second and the third weft stop are processed. Method according to one of claims 1 or 2 and 3,
characterized in that for the normal operation of the Doppelflorwebmaschine at least three different work programs, namely for the normal Schneidmesserhub each with a simple turning stroke outside the fabric width, stored for the normal Schneidmesserhub with integrated grinding process and for the normal Schneidmesserhub with integrated readjustment and processed after call. A method according to claim 8, characterized in that the three different work programs control different stroke sizes of the knife carriage, namely one with a first stroke size (h) with turn sections outside the fabric width, one having a second lift amount (h1, h1 ') including a first overstroke (U1, U1') beyond the turn portion (s) extending to the position (s) of the grinding device (s) ( 3, 3 ') extends (s) and one having a third lift amount (h2) which includes a second overstroke (U2) beyond a turn portion extending to the position of the adjustment device (6). Method according to claim 1, 2 and / or 8,
characterized in that different retrievable work programs for different Poleinbindungsarten (one-way symmetric Polbindungsart; two-, three- or multi-speed symmetric or asymmetric Poleinbindungsart) and / or are provided for different pole densities. Method according to one of claims 1, 8 and / or 10,
characterized in that different work programs are provided for differentiated according to their material and / or shape cutting blade (steel knife, carbide knives, ceramic knives, cut-off or single or multi-bladed knives). A method according to claim 8, characterized in that the current temperature of the cutting blade (11) is detected and fed to the control computer (5),
that the work programs for cutting operations contain evaluation programs for current temperature values of the cutting knife and
that when a predetermined limit value for the temperature of the cutting blade is reached by means of a control computer, a work program with an integrated grinding process is activated. A method according to claim 8, characterized in that the current position values for the trajectory of the tip of the cutting blade (11) are detected and fed to the control computer (5), that the working programs for cutting processes contain evaluation programs for position values for the trajectory of the tip of the cutting blade, and
that upon reaching a predetermined limit value for the position values of the tip of the cutting blade by means of control computer, a corresponding work program with integrated readjustment process for the knife (11) on the knife carriage (1) or the weaving machine stop is activated. Device for the controlled driving of the cutting blade (11) fixed on the knife carriage (1) for separating a double pile fabric (4) on a double pile loom,
with a servomotor for driving the knife carriage (1) via a toothed belt (16) or a ball screw along a guideway,
with a control computer for specifying drive programs for the servomotor and its synchronization with the rotational movement of the main shaft of the double-pile loom,
with at least one device for grinding the cutting blade and
with a device for adjusting the cutting blade,
characterized in that the cutting blade (11) on the knife carriage (1) at least one sensor (56) for the temperature measurement on the cutting blade (11) and / or a sensor (57) for detecting the position of the path of the cutting blade tip (11) is associated .
that means for transmitting the measured values of the sensors or the sensor to the control computer (sliding contact; transmitter 561 and receiver) are provided, and
that the control computer (5) comprises outputs for activating the sharpening device (3) and the adjusting device (6). Apparatus according to claim 14, characterized in that the knife carriage (1) a controllable, wedge-shaped expansion element (lift spindle 14) is arranged which is located between a relative to the knife carriage (1) immovable (12) and a movable jaw (131) for the cutting blade (11) and in the region of the readjustment position, the expansion element (lifting spindle 14) can be moved relative to the knife carriage (1) by means of setting means (toothed rack 22) fixed to the frame for releasing and / or fixing the cutting blade (11).

Images