EP1122348A1 - Driving device for the blade-holder carriage in a double plush loom - Google Patents

Abstract

The invention relates to a drive device for the knife carriage for separating a double pile fabric in the pile plane on a double pile weaving machine, with a reversible servo motor which can be controlled in accordance with predefined programs, to which a distance scale and a sensor for detecting current distance units are assigned, and with at least one transmission element for Transfer of the drive movement to the knife carriage that can be moved along a guide rail. With the aim of making the movement of the knife carriage (3) controllable even at high speeds and increasingly taking on the maintenance of the knife carriage in the automated work devices, the drive device is designed so that between the knife carriage (3) and the encoder unit / Travel scale (411, 412; 511, 512; 611, 612) practically inelastic, positively inserted transmission elements (toothed belt 42, 45; spindle 52, nut 53; coupling 63) are arranged. <IMAGE>

Description

The invention relates to a drive device for the knife carriage of a double pile weaving machine for separating a double pile fabric in the polar plane with a reversible servo motor that can be controlled according to specified programs, to which a distance scale and an encoder for recording current distance units are assigned are, and with at least one transmission element for transmitting the Drive movement on the knife carriage movable along a guide rail.

A drive device of the type described is u. a. by GB 890 393 known. The knife carriage that can be moved back and forth on a guide rail is driven by a reversibly controllable motor. Switching the Direction of drive takes place through stationary, representing certain geometric positions Contacts. These are proportional to the stroke movement of the Knife carriage switched sensors switched. The transmission of the drive movement a cord is attached to the knife carriage. The two ends of the Cord are in different directions, spiraling on the reversibly driven Drive drum wound up and are finally fixed with this connected. Such a drive device has several disadvantages.

Because of the pulsating displacement along the axis of the drive drum The drive drum cannot move in the plane of movement of the knife carriage. It is common to move this drive drum in the lower part of the weaving machine. The consequence is a significant one Extension of the cord.

With increasing increase in the working speed of the weaving machine and the Shortening the cycles for integrating a row of poles also means reducing the speed of movement of the knife carriage. Because of securing one high cutting quality and avoiding a high knife temperature also commanded the speed of the knife in the area of the fabric to keep as constant as possible. This in turn has the consequence of acceleration and retardation of the knife carriage outside the tissue in a lot short periods of time. The acceleration forces are like this big that the very long cord is extended by very large amounts.

When the movement begins, the knife carriage follows the specified drive movement only delayed. The speed of the knife in the tissue can not can be precisely defined. In any case, it is different. This changes the Cutting characteristics. The actual stroke of the knife carriage becomes uncontrollable large. It is not possible to perform any operations on the knife carriage that require precise positioning of the same. Another disadvantage This device is the high energy requirement for repeated acceleration and decelerating the mass-intensive drive drum.

DE 195 36 002 A1 proposes that the switchable switch be used instead of the reversible one Motors a servo motor, which according to a predetermined program in opposite directions is controllable to use. That kind of engines regularly contains a disc that rotates with the rotor, the angle markings as a kind of distance scale. An encoder detects these markings and converts them into impulses for the execution of a given control program around.

The hope was to design the acceleration and deceleration processes in this way to be able to maintain an almost constant line with reasonable elongation Cutting speed (10 to 16 m / sec) in the tissue can be guaranteed. With this form of drive, one actually achieved significantly higher ones Working speeds of the weaving machine.

With the further optimization of the various gears of the weaving machine and However, with the introduction of new pole integration processes, the time required for the Cutting z. B. a row of poles is available, always shorter. The string expands in the accelerations that still occur here unacceptable level if extremely stable and low stretch materials for the Cord can be used. Incidentally, here are the disadvantages of the drive drum, as described in relation to GB 890 393 with regard to of the variable process point and the large mass still as before available.

The synchronism of the movement of the knife carriage with the other assemblies the loom cannot be reliable despite the use of the servo motor enough to be guaranteed. The impossibility of the exact positioning of the Knife carriage within the weaving machine also prevents inclusion here the maintenance of the knife carriage in the automation process of the weaving machine.

With DE 34 20 106 C1 it was proposed to use an endless toothed belt To use transmission link. A motor rotating in one direction drives the toothed belt, which is guided by two wheels with a vertical axis. The Toothed belt is provided with a vertical pin. About this cone and one Coupling engaging on the pin and the knife slide (there as a handlebar the knife carriage is driven.

This form of drive enables a constant speed of the Knife during the cutting process in the tissue. The position and the stroke of the knife carriage can always be precisely defined.

A major disadvantage of this device, however, is that it does not with reasonable effort to different fabric widths and to different Pole formation process (two or three turns) can be adjusted. It is also not possible to move the knife carriage at a precisely definable position Bring to a standstill and maintenance processes on the knife carriage automatically to execute.

The connection between the toothed belt and has a considerable disadvantage the knife sled exposed. The pin inserted in the toothed belt is destroyed the timing belt for those caused by acceleration and deceleration Loads within a very short time.

The object of the present invention is to provide a drive device for a To propose knife slides, which makes it possible even at high working speeds the weaving machine and with highly effective pile binding processes Knife sledge always with a controllable speed and with a defined one Drive trajectory and create opportunities for maintenance operations to automate on the knife carriage.

This object is surprising by the features of claim 1 simple way solved. With the direct and almost play-free connection - between the combination of scale / encoder on the one hand and the knife slide on the other - ensures the execution of the program or programs in the Dependence on the actual position of the knife carriage. It is with Such a drive device is also possible at precisely predetermined positions Carry out maintenance work on the knife carriage.

If a toothed belt is used as the transmission element according to claim 2, can to implement the invention with proven and available technical means.

A particularly advantageous design of the knife carriage drive for very wide weaving machines describes claim 3. The expansion of the toothed belt can thus be reduced by more than 50%. The working speed of the weaving machine can be chosen significantly higher.

The embodiment according to claim 4 enables the realization of the invention by means of space-saving means. The version with a linear motor - according to claim 5 - has the significant advantage of further reducing the masses to be moved. The modification of the knife carriage according to claim 6 allowed by the now possible exact positioning of the knife carriage the automatic Readjusting the knife without operator intervention.

Fig. 1

einen Querschnitt entlang der Linie I - I in Fig. 2 durch einen Messerschlitten mit Mitteln für das Nachstellen des Messers,

Fig. 2

eine vereinfachte Draufsicht auf den Messerschlitten nach Fig. 1,

Fig. 3

eine Antriebsanordnung für einen Messerschlitten unter Verwendung eines Zahnriemengetriebes in einer vereinfachten Ansicht von oben,

Fig. 4

eine schematische Darstellung eines Linearmotorenantriebes für den Messerschlitten in einer Ansicht von der Vorderseite der Maschine,

Fig. 5

eine schematische Darstellung eines Spindelantriebes von oben,

Fig. 6

ein Weg-Geschwindigkeits-Diagramm für den Antrieb eines Messerschlittens und

Fig. 7

eine schematische Gesamtanordnung des Messerschlittenantriebes.

The invention will be described in more detail below using an exemplary embodiment. In the accompanying drawings:

Fig. 1

2 shows a cross section along the line I - I in FIG. 2 through a knife carriage with means for readjusting the knife,

Fig. 2

1 shows a simplified top view of the knife carriage according to FIG. 1,

Fig. 3

a drive arrangement for a knife carriage using a toothed belt transmission in a simplified view from above,

Fig. 4

1 shows a schematic representation of a linear motor drive for the knife carriage in a view from the front of the machine,

Fig. 5

a schematic representation of a spindle drive from above,

Fig. 6

a path-speed diagram for the drive of a knife carriage and

Fig. 7

a schematic overall arrangement of the knife carriage drive.

1 and 2 show a knife carriage 3 in different views for separating a double pile fabric 1 in the pile plane. Such devices are used both on double carpet weaving machines and on double plush weaving machines used. In this description we unify the two mentioned machines under the term double forging machines.

After separating the double pile fabric 1, two pile fabrics 11 and 12, which is pulled up or down and later wound up or be filed.

The knife carriage 3 is for this purpose in a manner known per se on a guided on the frame of the machine stably mounted guide rail 2. The knife sledge 3 carries and guides the knife 31 on its upper side. This knife 31 is pressed against the knife carriage 3 by the clamping plate 32. In the present In this case, the clamping lever 34 which presses on the knife carriage 3 takes over this pressing is pivotally guided by means of bearings 33. The necessary clamping force is provided by a Spring 341 applied.

The knife 31 has upward projections at its rear end attack the pressure bolts 311, each loaded by a spring 312. The Tensioning lever 34 can be in a predetermined position of the knife carriage 3 the stop 21 are operated by a pusher lever 24 so that it Knife 31 releases and the pressure pin 311 the same against the z. B. fixed to the frame Can push stop 21.

The knife carriage 3 has on its underside elements of a coupling 35 and 35 ', which is a strand of the toothed belt 45 detachable and form-fitting with the knife carriage 3 connect.

The knife carriage 3 described here has the task, for. B. the during a Working cycle of the pile weaving machine manufactured during a movement cut along the fabric 1. To ensure an optimal The cutting process is carried out at least once per double stroke of the knife carriage 3 outside the fabric 1, a grinding operation is carried out on the knife 31. For this Grinding process here grinding heads 25, 25 'are provided on both sides of the fabric 1 (see Fig. 7).

The permanent regrinding naturally also leads to a shift of the Cutting edge of the knife 31 in relation to the guidance of the tissue in the Cutting zone. A sensor 26 regularly checks the position of the knife edge Intervals. If a given positional deviation is determined, it is necessary to adjust the knife 31.

This readjustment movement is in the design of the knife carriage 3 according to the 1 and 2 in that the knife carriage 3 first in a Position is spent in which the cutting edge of the knife 31 is fixed to the frame Stop 21 is opposite and the trigger lever 24 the clamping lever 34 so actuates that it releases the knife 31 and the pressure bolts 311 the knife 31 can push against the stop 21.

When this process is finished, the trigger lever 24 reproduces the clamping lever 34 free and the knife carriage 3 can over a certain period of time Sensor 26 limited by its renewed signal, the separation of the double pile tissue 1 continue.

Instead of the spring-loaded pressure bolts 311, one can of course also use other means for moving the knife 31. For example, B. purely mechanically driven actuators or pneumatic or electropneumatic controllable actuators. It is important that one under the given conditions the energy required for this is available on the knife carriage 3 Has.

For this adjusting device for the knife 31 to take effect, it is necessary that the knife carriage 3 either during its normal movement cycle, preferably in the phase of reversal of movement, a sufficiently accurate occupies a defined position. For this purpose, the knife carriage 3 is a Drive device assigned, which makes it possible even with very large fabric widths and high weaving progress per unit of time, the knife slide 3 one To give drive movement that can be controlled at any time and the respective Conditions can be adjusted.

The basic diagram of such a drive is shown in FIG. 7. An endless one Toothed belt 45 is guided over two toothed belt pulleys 43, 43 '. The toothed belt pulley 43 receives its drive movement from the reversibly controllable servo motor 41 via the toothed belt 42. The servo motor 41 has for execution a predetermined control program of its movement with a disc 411 Angle division, which we would like to call the "scale". That scale is a fixed encoder 412 (Fig. 3) assigned, the pulses of which are consecutive Trigger program steps for the movement of the servo motor 41.

To avoid annoying stretches of the mostly very long (approx. 10m) Toothed belt 45 can also both toothed belt pulleys 43, 43 'one each Assign servo motor 41.

The control programs are executed in the usual way by the machine control 7 so specified that the synchronism with other drives of the weaving machine can be guaranteed.

A more precise representation of the drive with toothed belts 42, 45 can we can see from Fig. 3. This shows a position of the knife carriage 3, in which has moved to the right out of tissue 1. The knife sledge 3 has passed the grinding head 25 and is in the area of the sensor 26. If the encoder 26 places an insufficient knife board in this position fixed, the trigger lever 24 is driven when the knife carriage 3 before Stop 21 stands. This then presses the clamping lever 34 down. The knife 31 is released and comes under the action of the pressure pin 311 in the predetermined Position at stop 21.

If the knife 31 has already been worked too far, it may be effective of a stop (not shown) on the knife carriage no longer in the TARGET position (Fig. 2) are moved. In such a case, the sensor signals 26 of the machine control 7 this state. The machine is after one the specified program is stopped and the display shows that an exchange of the knife 31 by the operating personnel is required.

4 and 5 are two fundamentally different drives for the knife carriage 3 shown. 4 consists of a linear motor 6, on the guide rail 2 ', which serves here as a stator, with its Runner can be moved back and forth according to a predetermined program. The one for that necessary energy for driving the rotor 61 and for the control required information is supplied to the rotor via sliding contacts 62. The guide rail 2 is provided with markings. These represent in their entirety a distance scale 611 - analogous to the angle plate 411 of the servo motor 41 -. A transmitter 612 on the rotor 61 detects the respective position and releases the corresponding one Program sections for driving the rotor 61. The runner 61 is positively connected to the knife carriage 3 via a coupling 63, so that the drive movement generated is transferred to the knife carriage 3 without play becomes.

A drive device of this type is useful when the loom has a very large working width. The masses to be moved can be on one Minimum be reduced.

Such a drive with a linear motor is - from the basic concept - also a drive concept similar, in which a servo motor mounted on the knife carriage 3 with its drive pinion on a rack or the like along the Guide rail 2 rolls. The transmission of electrical drive energy and In this case, the control signals can be sent via flexible cables or sliding contacts respectively. The necessary control information could also be transmitted wirelessly.

5 has a frame-fixed arranged servo motor 51. This drives a spindle 53 directly here is arranged and aligned parallel to the guide rail 2. The knife sledge 3 has a nut 53 for cooperation with the spindle 52, which with the spindle 52 cooperates. The servo motor 51 has - in the usual way - a scale 511 in the form of an angle disk and an encoder 512.

The operation of the drives described for the knife carriage 3 is in Reference to the positions in the loom explained again with reference to FIG. 6 become. From the starting position shown in FIGS. 1 and 2, the Knife carriage 3 accelerated in area S1. It has its maximum speed reached when the knife 31 enters the tissue 1, in the cutting section S2. The knife 31 cuts the at this then reached speed Quantity of the single fibers of the pile handles offered there. Reaches the knife 31 the other fabric edge, the delay begins in area S3. The whole, Sg covered can be sufficient with the drive devices described are strictly observed.

The grinding heads 25, 25 'can be arranged in the areas S1 and S3. With regard to the placement of the sensors 26 and the trigger lever 24 for the You can readjust the knife 31 for one of these two sections S1 or S3 decide. The adjustment process is carried out - as already described - not with every double stroke, but only at longer intervals. For this reason, sections S1 and S3 can be designed so that in As a rule, optimal accelerations and decelerations can be realized.

In the event that the knife 31 must be readjusted by the control the machine the working speed of the machine is reduced and the knife carriage 3 longer in the readjustment position due to a special program (Fig. 2) remain. Such a way of working can be done during the weaving process worked at normal working speeds and the speed only can be reduced during an adjustment process.

Stopping the machine for the execution of an adjustment process can can even be avoided under certain circumstances. In any case there is an intervention of the operating personnel to implement the readjustment process completely avoidable.

Regarding the use of a servo motor for this application the extreme change between drive and braking is said to be still on it be noted that an intermediate circuit is provided for the loom in which all servomotors release theirs when braking Feed in energy and from which all servo motors accelerate and Take at least part of their drive energy from normal operation.

The braking energy then does not have to be converted into heat. It stands by considerable part for consumers other than electrical energy.

Reference list

1

Double fabric

11

Carpet fabric, upper

12th

Carpet fabric, lower

2nd

Guide rail

21

attack

22

Tissue guide

23

Tissue guide

24th

Pusher lever

25, 25 '

Grinding head

26

sensor

3rd

Knife sledge

31

knife

311

Thrust pin (actuator)

312

feather

32

Clamping plate

33

camp

34

Tension lever

341

feather

35, 35 '

clutch

36

Magnetic plunger

4th

Timing belt drive

41

Servo motor

411

scale

412

giver

42

Timing belt

43

Timing belt pulley

44

Leadership role

45

Timing belt

5

Spindle drive

51

Servo motor

511

scale

512

giver

52

spindle

53

mother

6

Linear motor drive

61

runner

611

scale

612

giver

62

Sliding contact

7

Machine control

71

Control unit

V

speed

S

path

S1

Acceleration section

S2

Cutting section (within the tissue)

S3

Delay section

Sg

Total distance

Claims (6)

Drive device for the knife carriage for separating a double pile fabric in the Po! Level on a double pile weaving machine, with a reversible servo motor that can be controlled according to predefined programs, to which a distance scale and an encoder for detecting current distance units are assigned, and with at least one transmission element for transmitting the Drive movement on the knife carriage movable along a guide rail,
characterized by
that practically inelastic, positively inserted transmission elements (toothed belt 42, 45; spindle 52, nut 53; coupling 63) are arranged between the knife carriage (3) and the encoder / displacement scale unit (411, 412; 511, 512; 611, 612). Drive device according to claim 1, characterized in that the unit encoder / displacement scale (411, 412) is assigned to the servo motor (41) which is mounted on the frame, that at least one toothed belt (42, 45) is assigned to the servomotor (41) as the transmission element and that the knife carriage (3) is positively connected to a strand of the toothed belt (45). Drive device according to claim 1 and 2, characterized in that that the toothed belt (45) is guided endlessly over two toothed belt pulleys (43, 43 ') and that both toothed belt pulleys (43, 43 ') are connected to the drive with servomotors (41) which are controlled synchronously with one another. Drive device according to claim 1, characterized in that the encoder / displacement scale unit (511, 512) is assigned to the servomotor (51) mounted on the frame, that the servo motor (51) is assigned a spindle (52) aligned parallel to the guide rail (2) as the transmission element and that the knife carriage (3) is positively connected in its direction of movement to a nut (53) guided on the spindle. Drive device according to claim 1, characterized in that the servomotor is designed as a linear motor, the stator of which is part of the guide rail (2) and the rotor (61) of which is connected to the knife carriage (3) that the encoder (612) is assigned to the rotor (61) and the distance scale (611) to the guide rail (2). Drive device according to claim 1, characterized in that the knife carriage (3) in a predetermined position, a sensor (26) for detecting the knife projection, in a second predetermined position, a device (stop 25, trigger lever 24) for temporarily releasing the connection between knife (31) and knife carriage (3) is assigned and that the knives (31) are assigned actuators (eg pressure bolts 311) for moving them, in the released state of the knife, relative to the knife carriage (3) into a predetermined cutting position.

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