EP0501222A1 - Device for threading the warp yarns in a weaving machine - Google Patents

Abstract

The device comprises a drawing-in member for the warp threads, a blade knife (22) for opening the respective sheet gap for the drawing-in member with the warp thread, and transport means for the gradual transport of the reed in its longitudinal direction. These transport means have a first, and a pincer-like, second transport element (BW or 48, 49), which extends over the length of the reed and is coupled to it in the operating state, the second transport element (48, 49) for intermittent engagement with the first transport organ (BW) is provided. With this solution, the two functions of sheet transport and sheet opening are decoupled and each can be optimized individually. This enables the feed frequency to be increased. In addition, blade knives and teeth are protected as much as possible. <IMAGE>

Description

The present invention relates to a device for pulling warp threads into a reed, with an organ, hereinafter referred to as a blade knife, for opening the respective leaf gap for the pull-in member with the warp thread, and with transport means for gradually transporting the reed in its longitudinal direction, the length of the individual Transport steps corresponds at least approximately to the pitch of the leaf teeth.

Devices of this type, which are also referred to as sheet pricking devices, are used in particular in automatic warp threading machines. In the long-known USTER DELTA warp threading machine (USTER - registered trademark of Zellweger Uster AG), the blade knife also serves as a means of transport for the reed by stabbing into the respective blade gap and opening it and transporting the blade by the intended step. After pulling in, the sheet is fixed by holding means and the sheet knife is pulled out of the sheet gap and returns to its starting position.

It has been shown that this double function of the blade knife can have disadvantageous effects in that the blade knife is subjected to excessive bending stress during the transport of the reed and on the other hand the blade teeth are also stressed. In addition, the double function of the blade knife also limits the drawing frequency, that is the number of warp threads that can be drawn in per minute.

The invention is now to provide a blade pricking device which enables both an increase in the drawing-in frequency and maximum protection of the blade knife and blade teeth.

According to the invention, this object is achieved in that the transport means mentioned have a first transport element, which extends over the length of the reed and is coupled to it in the operating state, and a pincer-like second transport element which is provided for intermittent engagement with the first transport element.

The decoupling of the two functions sheet transport and sheet opening according to the invention enables these functions to be optimized and thus an increase in the feed frequency. In addition, both the blade knife and the blade teeth are protected as much as possible, because no bending forces act on them during blade transport.

Fig. 1

eine perspektivische Gesamtdarstellung einer Einziehmaschine,

Fig. 2

eine Ansicht einer erfindungsgemässen Blattstecheinrichtung von oben gesehen,

Fig. 3

eine Ansicht in Richtung des Pfeiles III von Fig. 2,

Fig. 4

eine Ansicht in Richtung des Pfeiles IV von Fig. 3,

Fig. 5a-5c

ein erstes Detail der Blattstecheinrichtung; und

Fig. 6a, b

ein zweites Detail der Blattstecheinrichtung.

The invention is explained in more detail below using an exemplary embodiment and the drawings; show it:

Fig. 1

an overall perspective view of a drawing machine,

Fig. 2

a view of a leaf piercing device according to the invention seen from above,

Fig. 3

2 shows a view in the direction of arrow III of FIG. 2,

Fig. 4

3 shows a view in the direction of arrow IV of FIG. 3,

5a-5c

a first detail of the blade piercing device; and

6a, b

a second detail of the blade piercing device.

According to FIG. 1, the drawing-in machine consists of a base frame 1 and of various assemblies arranged in it, each of which represents a functional module. A warp beam carriage 2 with a warp beam 3 arranged on it can be seen in front of the base frame 1. The warp beam carriage 2 is coupled via the warp beam 3 to a device for receiving and holding a pull-in frame 5, hereinafter referred to as a lifting device 4, on which the warp threads KF are stretched. This clamping takes place before the actual drawing in and at a location separate from the drawing machine, the drawing frame 5 being positioned at the lower end of the lifting device 4 in the immediate vicinity of the warp beam 3. For the pulling-in, the warp beam carriage 2 with the warp beam 3 and lifting device 4 is moved to the so-called upgrade side of the pulling-in machine and the pulling frame 5 is lifted by the lifting device 4 lifted up and hooked into the base frame 1, where it then occupies the position shown. The frame 5 is suspended in a transport device (not shown) mounted on the front upper longitudinal member 6 of the base frame 1.

During the pulling-in process, the frame 5 and the lifting device 4 with the warp beam carriage 2 and the warp beam 3 are shifted in the longitudinal direction of the carrier 6 from left to right. With this shifting, the warp threads KF are guided past a thread separating stage FT, which has a device for dividing the warp threads and for cutting off the divided warp threads KF and a device for presenting the cut warp threads to a pull-in needle 7, the latter forming part of the so-called pull-in module. The sectioning device used in the USTER TOPMATIC warp knitting machine can be used, for example, to separate the warp threads.

In addition to the pull-in needle 7, a monitor 8 can be seen, which belongs to an operating station and is used to display machine functions and machine malfunctions and for data input. The operating station, which forms part of a so-called programming module, also contains an input stage for the manual input of certain functions, such as crawl gear, start / stop, repetition of operations, and the like. The drawing-in machine is controlled by a control module containing a control computer, which in a control box 9 is arranged. In addition to the control computer, this control box contains a module computer for each so-called main module, the individual module computers being controlled and monitored by the control computer. The main modules of the drawing machine are, in addition to the modules already mentioned, drawing module, yarn module, control module and programming module, the strand, the lamella and the sheet module.

The thread separation stage FT, which presents the warp threads KF to be drawn in to the pull-in needle 7, and the path of movement of the pull-in needle 7, which runs perpendicular to the plane of the stretched warp threads KF, determine a plane in the region of a support 10 forming part of the base frame, which supports the already mentioned upgrade side of the so-called disassembly side of the drawing machine. The warp threads and the individual elements into which the warp threads are to be fed are fed in on the upgrade side, and the so-called dishes (strands, lamellae and sheets) with the drawn-in warp threads can be removed on the tear-down side. When all the warp threads KF have been drawn in and the frame 5 is empty, the latter is located together with the lifting device 4, the warp beam carriage 2 and the warp beam 3 on the dismantling side and can be removed from the base frame 1.

Immediately behind the level of the warp threads KF, the warp thread guard slats LA are arranged, behind them the healds LI and further down the reed. The lamellae LA are stacked in hand magazines, and the full hand magazines are hung in inclined feed rails 11, on which they are transported to the right, towards the pull-in needle 7. There they are separated and brought into the feed position. After pulling in, the slats LA arrive on slat support rails 12 on the dismantling side.

The strands LI are lined up on rails 13 and shifted thereon to a separation stage. Then the healds LI are individually brought into their retracted position and, after they have been drawn in, are distributed to the corresponding heald frames 14 on the dismantling side. The reed is also moved past the retracting needle 7 step by step, the corresponding gap in the sheet being opened for the retraction. After being drawn in, the sheet is also on the dismantling side. To the right of the heald frames 14 is a part of the reed WB. This illustration is to be understood purely for illustrative purposes, since the reed is of course located on the upgrade page in the position of the frame 5 shown.

As can be seen from the figure, a so-called crockery trolley 15 is provided on the dismantling side. This is inserted together with the slat support rails 12, heald frames 14 and a holder for the reed attached to the base frame 1 in the position shown and wears the dishes with the KF warp threads drawn in after being drawn in. At this point in time, the lifting device 4 and the warp beam carriage 2 with the warp beam 3 are located directly in front of the dishwashing carriage 15. Now the dishes are reloaded from the dishwashing carriage 15 onto the warp beam carriage 2 by means of the lifting device 4, which then carries the warp beam 3 and the pulled-in dishes and can be driven to the weaving machine in question or to an interim storage facility.

The individual main modules of the drawing-in machine are made up of sub-modules, which are each intended for specific functions. This modular structure is not the subject of the present invention. In this context, reference is made to the Int. Application No. PCT / CH90 / 00227 referenced.

The so-called blade piercing device, which forms the main component of the blade module, will now be described below. The blade piercing device is used to move and position the reed WB step by step, sheet gap by sheet gap, past the pull-in needle 7, and to spread the sheet gap into which a thread is to be drawn in so far that the pull-in needle 7 can pass. Corresponding to these two functions, the sheet piercing device has transport means for the woven sheet WB and an organ for opening the respective sheet gap, a so-called sheet knife.

FIG. 2 shows a top view of a leaf piercing device according to the invention, FIG. 3 shows a front view, seen from the reed WB, and FIG. 4 shows a side view, based on FIG. 1, seen from the right. 5a to 5c show a first detail in three views, namely Fig. 5a shows a front view, Fig. 5b shows a section along the line A-A of Fig. 5a and Fig. 5c shows a plan view. 6a and 6b show a second detail, namely FIG. 6a shows a front view and FIG. 6b shows a view in the direction of arrow B of FIG. 6a, partly in section.

As shown, the entire blade piercing device is carried by a carrier 16, which in turn is screwed to a support 17 forming part of the base frame 1. The carrier 16 is plate-like and is oriented essentially parallel to the plane of the pull-in frame 5 (FIG. 1). At its right end in FIGS. 2 and 3, the carrier 16 has two stiffening ribs 18 and a vertically protruding end plate 19, to which a stepping motor 20, which is only indicated in the figures, is attached. The latter serves as a drive for the transport of the reed WB. At the left end in FIGS. 2 and 3, the carrier 16 has a horizontal extension 21 on which the blade knife 22 is arranged with its drive. The position of the pull-in needle is identified in FIG. 3 by reference number 23.

According to FIGS. 2 and 4, a support 24 with a horizontal base plate and with a vertical front, middle and rear wall is fastened on the extension 21. Between the front and the middle wall, two guide pins 25 extend, on which a knife holder 26 is slidably mounted. The latter consists of a base body and a jaw holder for the blade knife 22 carried by the latter, which is made of a carbon fiber reinforced plastic, for example PEEK or LCP. Of course, the blade 22 can consist of steel as before; the plastic mentioned has proven to be particularly suitable, however, because with this material both the leaf teeth and - surprisingly - the knife itself are practically not worn out and are therefore eliminated as a potential source of interference.

The knife holder 26 is connected to a piston rod 28 connected to a pneumatic drive 27 and is moved back and forth by this between two positions. In the front position shown in FIG. 2, the blade knife 22 is in engagement with the reed, which is not shown in FIGS. 2 to 4, and thereby opens the corresponding blade gap for the passage of the pull-in needle 7 (FIG. 1) and thus for the insertion of a warp thread. In the rear position shown in FIG. 4, the reed is released from the blade knife 22 and can be moved. The two named positions of the knife holder 26 and thus the blade knife 22 are monitored by sensors 29 for the rear position and 30 for the front position. These sensors are inductive sensors which respond to steel bodies embedded in the knife holder 26 at suitable points.

The reed WB is held in a reed carriage BW shown in FIG. 4, which is slidably guided in the longitudinal direction of the base frame 1 and thus also of the reed WB. A profile rail 31, which is mounted in the base frame 1 (FIG. 1) and in which vertical sheet carriers 32 arranged at a distance from one another are guided, serves as a guide. The blade carrier 32 consist of a lower part, to which running rollers 33 are fastened in the profile rail 31, and of an upper part with means 34 for height adjustment and with clamping screws 35 for fixing the reed in the region of its lower waistband. The individual blade supports 32 are screwed to a profile rail 36, which fulfills a double function: on the one hand, it connects the blade supports 32 to one another and thus forms the blade carriage BW with them, and on the other hand, their horizontal leg forms a type of driver, which can be clamped by a corresponding clamping member is so that when this clamping member moves, the sheet carriage BW and thus also the reed held by it are displaced: because of this latter function of the profiled rail 36, this is referred to below as the clamping rail.

The clamping element mentioned will now be described below: As already mentioned, the reed transport is driven by the stepper motor 20, which drives a shaft 37 in an oscillating manner. The shaft 37 is threaded at its end remote from the stepper motor 20 and on this part is encompassed by a lock nut-like bush 38, so that, like when the lead screw and lock nut of a lathe work together, a rotational movement of the shaft 37 increases the stroke of the bush 38 caused. The socket 38 is connected to a carriage 40 via a connecting piece 39.

As can be seen from FIGS. 2 to 4, a support arm 41 is fastened to the carrier 16 on both sides of the slide 40, which has an approximately L-shaped shape with the cross leg at the top and with a short projection at the bottom. A guide shaft 42 is fastened in each of these projections, which runs between the two support arms 41 and thus passes through the carriage 40.

As can be seen in particular from FIGS. 5a to 5c, the slide 40 likewise has a cross section in the form of an L turned upside down and it is penetrated by the guide shafts 42 in the region of the ends of its two legs and is displaceably mounted thereon. In the area of its side surfaces adjacent to the support arms 41, the slide 40 has a crossbeam 43 each. Between the two crossbars 43 and the cross leg of the carriage 40, two vertical guide bolts 44 are arranged, on which a clamp 45 is guided adjustable. This clamp is shown in Figures 6a and 6b.

The centerpiece of the clamping pliers 45 is a pneumatic cylinder 46 which is fastened to a profile part 47 with four screws. This is penetrated by the guide bolts 44 fastened on the carriage 40. The pneumatic cylinder 46 is firmly connected to a jaw-shaped part which forms the first clamping jaw 48 of the clamping pliers 45. The second clamping jaw, which is designated by the reference symbol 49, is driven by a piston 50 of the pneumatic cylinder 46; it is penetrated by the guide bolts 44 and guided on them. As can be seen from FIGS. 5a and 5b, the crossbeams 43 worked on the slide 40 form spacing means between the profile part 47 and the second clamping jaw 49.

The pneumatic cylinder 46 has two air connections 51 for the supply of compressed air for closing and opening the clamping pliers 45. When the clamping pliers 45 are closed, the air in the pneumatic cylinder 46 presses the piston 50 and thus the second clamping jaw 49 downwards until it presses against the clamping rail 36 (FIG. 4). The entire pneumatic cylinder 46, including the first clamping jaw 48, now moves upward relative to the second clamping jaw 49 fixed on the clamping rail 36 also presses the first clamping jaw 48 against the clamping rail 36, as a result of which it is fixed in the clamping pliers 45.

Now the blade carriage BW (FIG. 4) can be transported one step further by the clamp pliers 45, which is done by the stepper motor 20 (FIG. 3). This is designed such that the possible division of the reed is a multiple of the step length of the stepping motor 20. On the shaft 37 driven by the stepper motor 20, a sensor disk 52 having a sector-like recess with a starting edge is fastened, to which an inductive sensor is assigned. This sensor, which controls the transport sequence, is activated when the stepping motor 20 and the encoder disk 52 rotate by the said starting edge, as a result of which the start of the transport of the sheet carriage BW is precisely defined and this transport is initialized. Since the transport step to be carried out varies in size depending on the sheet type, it is set (programmed) accordingly on the stepper motor. After the rotation angle of the encoder disk 52 corresponding to the predetermined transport step, which is always substantially smaller than 360 °, the stepping motor 20 is at a standstill, with which the transport of the sheet carriage BW is ended. Now the blade knife 22 can pierce the corresponding blade gap and the stepping motor 20 and the encoder disk 52 turn back into their starting position.

In summary, the transport of the blade carriage BW and thus of the reed takes place as follows: The stepper motor 20 drives the slide 40, which is horizontally displaceably mounted on the guide shafts 42, via the shaft 37 and the bush 38. On this carriage 40, the clamping pliers 45 are mounted adjustable in the vertical direction via the guide bolts 44, the height of the entire clamping pliers 45 being adjustable on the one hand, and on the other hand the two clamping jaws 48 and 49 being adjustable to different heights by the mutual adjustability of the pneumatic cylinder 46 and piston 50 are. The latter means that the clamping pliers 45 can automatically adjust themselves to different heights of the clamping rail 36.

As has already been described, the knife holder 26 with the blade knife 22 is driven by the pneumatic drive 27. This is completely independent of the control of the stepping motor 20 and the drive of the pneumatic cylinder 46, so that the two functions of opening the sheet and transporting the sheet are mechanically autonomous. They are synchronized via the module computer contained in the control box 9 (FIG. 1), which evaluates the signals from the sensors 29, 30 (FIGS. 2, 4) and the sensor assigned to the sensor disc 52 and controls the blade piercing device accordingly.

• 1. Warteposition des Schrittmotors 20.
• 2. Ausfahren des Blattmessers 22 aus dem Webblatt.
• 3. Start Schrittmotor 20 und dadurch Verschiebung Schlitten 40 und Transport Blattwagen BW.
• 4. Stop Schrittmotor 20 und Schlitten 40.
• 5. Einfahren Blattmesser 22 in Webblatt und dadurch Blattöffnung.
• 6. Aufhebung der Klemmung durch Klemmzange 45. Das Webblatt ist jetzt durch das Blattmesser 22 positioniert, durch welches es auch feinpositioniert wird.
• 7. Rücklauf Schrittmotor 20 und dadurch Rücktransport von Schlitten 40 und Klemmzange 45.
• 8. Warteposition der Klemmzange 45 (Wartezeit etwa 100 ms).
• 9. Betätigung der Klemmzange 45.
• 10. Zyklusende.
• 1. Beginn eines neuen Zyklus mit Ausfahren des Blattmessers 22 aus dem Webblatt.

The timing of a cycle of the individual functional steps is as follows:

• 1. Waiting position of the stepping motor 20.
• 2. Extending the blade knife 22 from the reed.
• 3. Start stepper motor 20 and thereby shift carriage 40 and transport sheet carriage BW.
• 4. Stop stepper motor 20 and carriage 40.
• 5. Retracting blade 22 into reed and thereby opening the blade.
• 6. Removal of the clamping by means of clamp pliers 45. The reed is now positioned by the blade knife 22, by means of which it is also finely positioned.
• 7. Return stepper motor 20 and thereby return transport of slide 40 and clamp 45.
• 8. Waiting position of the clamp 45 (waiting time about 100 ms).
• 9. Actuation of the clamp pliers 45.
• 10. End of cycle.
• 1. Start of a new cycle with the blade knife 22 extended from the reed.

When a new chain begins to be drawn in, the reel carriage BW is brought into its starting position by hand with the reed, which is marked by a stop. Since, at the start of the very first cycle, the blade knife 22 is of course not moved into the reed, step (2) is omitted in this (first) cycle.

Claims (13)

Device for pulling warp threads into a reed with an organ referred to below as a blade knife for opening the respective blade gap for the retracting organ with the warp thread, and with transport means for gradually transporting the reed in its longitudinal direction, the length of the individual transport steps being at least approximately the division of the Leaf teeth corresponds, characterized in that the said means of transport have a first, extending over the length of the reed and coupled to it in the operating state, and a pincer-like, second transport member (BW or 45), which is provided for intermittent engagement with the first transport member is. Device according to claim 1, characterized in that the first transport member is formed by a sheet carriage (BW) having a clamping rail (36). Apparatus according to claim 2, characterized in that the second transport member has a pair of clamping tongs (45) with two adjustable clamping jaws (48, 49). Apparatus according to claim 3, characterized by a carriage (40) which is adjustably mounted in the longitudinal direction of the reed and on which the clamping pliers (45) are mounted such that they can be adjusted in height. Apparatus according to claim 4, characterized by a stepping motor (20) provided for the adjustment drive of the slide (40), which is connected to the slide via a shaft (37) and a bushing (38) encompassing it in the manner of a lock nut. Device according to claim 3, characterized in that the clamping pliers (45) have a pneumatic cylinder (46) which is fixedly connected to a clamping jaw (48). Apparatus according to claim 6, characterized by a piston (50) which is mounted in the pneumatic cylinder (46) and is connected to the other clamping jaw (49). Device according to claim 1, characterized in that the blade knife (22) consists of plastic, preferably of a carbon fiber reinforced material. Device according to one of claims 1 to 8, characterized in that the blade knife (22) clamped in a knife holder (26) and that its drive opposite that of the second transport member (45) is mechanically autonomous. Apparatus according to claim 9, characterized in that the knife holder (26) is connected via a piston rod (28) to a pneumatic drive (27) and can be moved back and forth by the latter between two end positions, and in that a sensor (29 , 30) is provided. Apparatus according to claim 10, characterized in that the sensors (29, 30) are formed by inductive sensors and that metal parts for exciting the inductive sensors are contained in the knife holder. Apparatus according to claim 9, characterized in that the knife holder (26) with the blade knife (22) and the pincer-like transport member (45) with its drive are arranged on a common carrier (16). Device according to claims 5, 6 and 10, characterized in that the stepping motor (20), the pneumatic cylinder (46) and the drive (27) of the piston rod (28) are arranged on a common carrier (16).

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