EP0311781B2 - Starting-up device for creels - Google Patents

Description

The invention relates to a device with the features of the preamble of claim 1.

Such a device is known from DE-OS 34 36 714. The known thread clamp has a horizontal clamping jaw that presses a horizontal thread against the underside of a plate-shaped horizontal abutment. This is done by an even if horizontally acting adjusting rod, which acts on one end of a leaf spring, the other end of which is fixed when clamping or braking the thread on a clamping piece which is immovable in the adjusting direction. The jaw of the thread clamp is attached approximately to the middle of this leaf spring. As a result of this configuration, when the thread is acted on, the clamping jaw performs a relative movement to this abutment in the actuating direction of the adjusting rod and thus in the longitudinal direction of the abutment. In addition, the clamping force also has an oblique orientation to the abutment, which results in complications during machine start-up. In particular with thin twisted threads, a tendency to untwist the thread can result from a corresponding impact, which is associated with corresponding thread displacements or displacements at the thread braking point and prevents the desired correct influence on the thread braking.

From US-A 4 598 184 a thread clamping device for clamping threads is known during their unwinding of bobbins from bobbin creels by warping machines, each of which has a thread monitor having a guard needle, the thread being clampable between an abutment and a cooperating, limitedly movable clamping jaw which is under the influence of an actuator. When it is actuated, the known clamping jaw is pivoted around a base point below the clamping point and, after the warping machine has started up, is moved from its clamping position into an open position in order to no longer influence the unwinding resistance of the thread. A controlling action on the jaw of the known thread clamp during machine start-up is not provided.

DE 23 57 430 C3 discloses a thread clamping device which is similar in structure to US Pat. No. 4,598,184 and is only kept closed when the winding machine is at a standstill and when starting up. It is opened in normal operation. In this thread clamping device, too, the clamping jaw is pivoted about a base point below the clamping point, and a controlling action on the clamping jaw during machine start-up in the sense of controlling the clamping force between the clamping position and the open position is not provided.

From US-A 4 605 132 a thread brake for winding machines is known, in which plane-parallel brake plates are more or less pressed together by an adjusting screw. A start control is not available.

From apparently previously used thread tensioner / monitor elements, model GCF, from Benninger, CH-9240 Uzwil, it is known to design a jaw that is movably articulated on a bolt acted on by an adjusting device and to have its clamping force perpendicular to the abutment surface. With these elements, however, there is no control in the sense of the preamble of claim 1.

The invention is therefore based on the object of improving a creel of the type mentioned with regard to its thread clamps in such a way that the threads can be braked properly with all possible thread configurations.

This object is achieved by the features of the characterizing part of claim 1.

It is important for the invention that an influence is exerted on the movement of the clamping jaw during the clamping force control, which no longer permits relative movements in the direction of the longitudinal extent of the abutment.

Rather, the clamping force is only applied perpendicular to the abutment surface, so that the thread run or the clamping point within the thread clamp cannot be changed by influencing variables from the thread clamp itself.

There are a variety of constructive ways to achieve the aforementioned guidance or influence on the jaw. However, it is advantageous if the clamping jaw acted upon by the control spring is held by a movable bolt arranged perpendicular to the abutment surface and to the thread. In this case, the bolt can be given exactly the desired direction of movement of the clamping jaw acted upon by the control spring, and additional guide measures are unnecessary. In this sense, the bolt is axially displaceably mounted in a clamp housing having the abutment surface and penetrates the movable jaw without radial play, the end of the jaw on the back of the jaw engaging the movable jaw with movable axial play, so that the desired clamping force control and a defined clamping behavior can be achieved on the one hand. The axial play between the jaw and the end of the bolt is achieved in that the jaw has projecting actuating tabs on the back with slots parallel to the bolt into which a transverse pin of the bolt is inserted takes hold.

In order to optimally match the design of the control spring to the bolt influencing or controlling the thread clamp, the control spring acting on the clamping jaw surrounds the bolt and is supported at the other end on the cross pin of the bolt.

It is also important that the clamping jaw is arranged to move to a limited extent from its thread clamping position against the control spring acting on it. As a result, in particular in the case of a control spring with a flat characteristic, it is possible to clamp threads of different thicknesses with the thread clamp without influencing the clamping and control characteristics of the thread clamp. Construction tolerances of the thread clamp can also be controlled perfectly.

The bolt is acted upon by a clamping spring which is supported in the terminal housing and which holds the bolt when the clamping jaw is in the clamping position while overcoming the force of the control spring of my contact position on the housing. As a result, the pin has a defined rest position in the housing, which also ensures that the force of the control spring in the clamping position of the thread clamp has a single defined value.

In an embodiment of the invention, the thread clamp has a thread guide element holding the thread above the bolt. An abrasion of the thread on the bolt and largely also on the clamp parts is thus avoided, so that the ease of movement of the bolt and the control of the thread clamp cannot be unintentionally influenced by thread abrasion or stiffness of the bolt.

Furthermore, on the abutment forming the abutment surface there is a projection which limits the vertical thread deflection upwards. The projection also has a substantially vertical thread guiding edge which delimits thread deflections directed transversely thereto. Due to the above configurations of the thread clamp, the thread is forced into its clamping area. The thread is not able to make changes in position in the area of the thread clamp in such a way that the elements causing the control can be influenced by the dynamics contained in the thread. The height of the thread clamping point is practically fixed relative to the clamping jaw, so that, for example, its tolerance-related tilting play around a horizontal axis has no influence on the clamping or control of the thread clamping. In addition, the above-described guiding of the thread in the clamping area of the thread clamp or the fixing of the thread running point in the thread clamp ensures that the guard needle is not exposed to unwanted dynamic influences resulting from the thread path. In particular, the guard needle need not be used to limit vertical thread deflections.

As a result, in the case of bobbins for slip machines or warping machines, the winding stations of which are arranged in rows and rows, one thread monitor each with a guard needle causing a thread deflection and one thread clamp in each case, are associated with an essentially vertical insertion slot of the part to be inserted into the thread clamp It is possible for the thread that the upper end of the guard needle is arranged without any slot overlap in all possible needle positions. The thread can therefore be inserted without any problems, without the construction of the thread clamp having to take into account the need to bring the thread into a specific relative position to the end of the guard needle or without the risk that the inserted thread gets out of the height region of the guard needle and as a result guarding is not possible.

In this sense, the needle end is advantageously arranged above a projection that limits the vertical thread deflection upward and on the housing side next to the insertion slot, the thread deflection upward limiting projection reliably preventing the thread from coming out of the height range of the guarding needle that enables a monitoring.

The invention is explained with reference to an embodiment shown in the drawing.

• Fig. 1 Eine perspektivische Gesamtansicht einer Vorrichtung für die Anlaufsteuerung von Spulengattern,
• Fig. 2 eine Frontansicht der Vorrichtung der Fig. 1,
• Fig. 3 eine komplette Seitenansicht der Vorrichtung der Fig. 1 auf deren Wächternadelseite,
• Fig. 4 eine der Fig. 3 entsprechende Ansicht bei entfernter Gehäuseabdeckung,
• Fig. 5 einen ergänzten Schnitt V-V der Fig. 3,
• Fig. 6 einen ergänzten Schnitt VI-VI der Fig. 3 und die
• Fig. 7a bis 7c Längsschnitte durch eine in eine vertikale Gestellschiene des Spulengatters eingebaute Vorrichtung in vereinfachter Darstellung zur Erläuterung der Wirkungsweise der Fadenklemme.

It shows:

• 1 is an overall perspective view of a device for the start control of creel,
• 2 is a front view of the device of FIG. 1,
• 3 is a complete side view of the device of FIG. 1 on its guard needle side,
• 4 is a view corresponding to FIG. 3 with the housing cover removed,
• 5 shows a supplemented section VV of FIG. 3,
• Fig. 6 shows an expanded section VI-VI of Fig. 3 and
• 7a to 7c longitudinal sections through a device installed in a vertical frame rail of the creel in a simplified representation to explain the operation of the thread clamp.

1 is one of many for influencing the running of a thread 4 from a winding unit 1 provided with a bobbin 22 in the direction of arrow 23 to a winding machine (not shown). This winding machine winds up all threads of the creel 4, each of which passes through a device deflected on a guard needle 2. An essential part of this device, which is used in particular for so-called V-gates, the thread speeds of which are comparatively high, are a thread clamp 3 and a thread monitor with a guard needle 2. The continuous thread 4 loops around the guard needle 2 and keeps it in one because of its thread tension Position in which a signal transmitter 24 of the thread monitor which interacts with it and is outlined in FIG. 4 does not give a signal. However, if the thread breaks and the thread tension consequently decreases, the watchdog needle 2 causes a signal to be sent and the winding machine to be stopped. In addition, the other threads 4 are kept taut so that there is no tangled thread which would impair the thread family due to thread sag. In addition, it must be ensured that the restart is controlled so that the thread set is monitored from the start. The requirements resulting from these operating requirements, which must also be met by the device described, are described in detail in Fig. 8 of DE-OS 34 36 714. Reference is made to this and to the associated description.

The device shown in the figures has a clamp housing 11 which receives or supports the thread clamp 3 and the thread monitor. The thread clamp 3 consists essentially of an abutment 5 and a jaw 6, which is relatively movable to the abutment 5. These components are attached to a housing body 25 which is closed all round and has an installation opening 26 on the needle side for the installation of parts of the thread clamp 3 and the thread monitor, which is closed by a cover plate 27 which is fastened to the housing body 25 with fastening screws 28. The cover plate 27 also has a protruding sheet metal hook 37 according to FIG. 3 and at least parts of an insertion slot 20 with a diamond-shaped recess 38. In addition, the sheet metal hook 37 is at its free end according to FIG. 1 via a wire bracket 40 with the terminal housing 11 or its connected to the cover plate 27 opposite the housing side, the bracket 40 forming a thread guide element 17, which does not allow the thread 4 to lower deeper.

The cover plate 27 supports the guard needle 2 with a pivot pin 29 which is inserted into a sleeve piece 31 arranged on the other side of the cover plate 27 and engages with a free end in a molded connection piece 32 of the housing body 25. A contact finger 33 is attached to the sleeve piece 31 and ensures that the signal generator 24 emits a signal when it comes to rest against the signal generator 24 provided with two contact tabs 35 from its position shown in FIGS. 3, 4. This is the case when the watchdog needle 2 tilts clockwise from the position shown in FIG. 3, which it does because of its center of gravity located to the right of the axle pin 29 as a result of the action of gravity. In the tilted position, the guard needle 2 does not protrude into the insertion slot 20 for the thread 4 explained below.

The guard pin 2 is inserted with its lower angled end into a bore in the axle pin 29 and fastened to it with a grub screw, not shown, which is actuated with an internal polygonal recess 30 shown in FIG. 6. In its position shown in Fig. 3, in which it is held by the tensioned thread 4, its middle, the thread deflecting needle section runs approximately parallel to the front surface 11 'of the terminal housing 11. The upper end 21 of the guard needle 2, the whole is arranged approximately parallel to the sheet, is bent back towards the bottom 36 of the body 25, its inclination towards the thread-guiding section of the needle 2 being opposite to the inclination of the lower end of the needle 2.

The abutment 5 is a substantially L-shaped sheet metal part in cross section, which is installed in a correspondingly shaped recess in the housing body 25 and lies flush with the outer surfaces thereof. 4 and with fastening screws 39. The abutment 5 has an abutment surface 9 facing the thread 4.

In addition, the abutment 5 has a bore through which a bolt 10 passes, essentially without radial play and vertically to the abutment surface 9.

The jaw 6 is a sheet metal part which is fixed to the bolt 10. For this purpose, the clamping jaw 5 has actuating tabs 13 projecting on the rear side, which are parallel to one another and lie opposite one another at the same height and have slots 14 of equal length. The ends of a cross pin 15 of the bolt end 12 engage in these slots and the bolt 10 is axially displaceable to such an extent that the clamping jaw 5 can be lifted off the abutment surface 9 if the bolt 10 is subjected to a correspondingly large axial load. For the rest, the clamping jaw 6 according to FIG. 1.5 has an approximately U-shaped cross-sectional configuration and has an angled portion at its upper end 6 'which facilitates thread insertion.

The bolt 10 is assembled with the clamping jaw 6 in such a way that the cross pin 15 does not press directly on the jaw 6. Rather, this is held on the abutment 5 by spring force. This spring force is generated by a control spring 7. Inside the terminal housing 11, a clamping spring 16 is arranged surrounding the bolt 10, which is supported on the one hand on this terminal housing 11 and on the other hand on a further transverse pin 42 of the bolt 10, with which the bolt 10 is pushed to the left in FIG. 5 on the housing 11 becomes. The clamping spring 16 is stronger than the control spring 7 surrounding the bolt 10 between its cross pin 15 and the clamping jaw 6, which counteracts the clamping spring 16 and is unable to influence the position of the bolt 10. However, it causes the clamping jaw 6 to bear against the abutment surface 9 with a force determined by it. This force can be precisely metered by adjusting the bolt 10 and consequently also the force with which the clamping jaw 6 presses on the thread 4 when the bolt 10 is adjusted.

5 with the bolt 10 in the unadjusted position there is axial play between the jaw 6 and the transverse pin 15, which permits corresponding displacements of this jaw 6, e.g. B. when threading, without having to adjust the bolt 10. In the case of thicker threads, the position of the bolt 10 also remains unaffected.

1 to 5 that the abutment 5 has a Z-shaped projection 19 which projects into the diamond-shaped recess 38 of the cover plate 27. On the one hand, this projection 19 has an edge section 19 'which delimits vertical thread deflections at the top. As a result, the thread 4 is secured in connection with the thread guide element 17 according to FIG. 2 against shifting in height, so that the thread clamping point is practically immovable vertically, which contributes to the constancy of the braking effect on the thread 4. Furthermore, the projection 19 also has a thread guide edge 18 which limits horizontally directed thread deflections, the horizontal clearance required for the thread 4 due to the movement of the guard needle 2 not being cut.

Otherwise, the projection 19 is shaped such that it completes the insertion slot 20 in the region of the recess 38 with the cover plate 27 so that the thread 4 is fed comparatively easily from above into the thread runner when the device is inserted, the bracket 40 above the Thread clamp 3 in connection with the shape of the housing 11 ensures a horizontal extension of the insertion slot 20. The guard needle 2 is designed in particular with its upper end 21 so that it is not acted upon when the thread 4 is inserted until it has reached the thread clamping parts determined by the section 19 'of the projection 19 and the thread guide element 17. The thread guide 17 also ensures that the thread 4 is held above the bolt 10, so that the latter cannot produce thread abrasion.

The assembly of the device with the gate takes place via fastening screws 43 which are screwed into fastening tabs 44 of the housing 11 and thereby fix this housing 11 to a U-shaped vertical frame carrier 45 of the gate. In a rack support 45 there is an adjusting device 8 in the form of an adjusting rod and all rack rods can be acted upon in parallel, so that a corresponding joint action on all thread clamps is possible. A control plate 46, which has a control surface 47, is fastened to the adjusting device 8 for each thread clamp 3. With this control surface 47, the bolt 10 can be correspondingly horizontally displaced when the height of the adjusting device or rod 8 is adjusted, and as a result compress the clamping spring 16 and relieve the control spring 7.

7a shows the clamping position of the thread clamp 3, in which the clamping jaw 6 presses on the thread 4 under the action of the springs 7, 16 and keeps it tensioned so that it cannot slip any further. 7b shows a deflection of the pin 10, in which the clamping spring 16 is partially compressed and the spring 7 has been relieved of the adjustment of the pin 10 accordingly. The bolt 10 reaches such a position through the control with the adjusting device 8 during the start-up of the winding machine pulling off all the threads 4 already during the first running meters of the thread family. 7b shows the state of the thread brake 3 shortly before the clamping jaw 6 is lifted off from the abutment 5. Thread monitoring takes place from the moment when a thread 4 reaches a thread tension on the basis of which the response threshold of the thread monitor is reached. 7c shows the clamping jaw 6 lifted off the abutment 5, the displacement being achieved by the cross pin 15 acting on the actuating tab 13.

Claims (10)

1. Device for the start-up control of yarn creels for weaving or gathering machines, whose yarn supply stations (1) arranged in rows and columns each have associated therewith a yarn monitor and a yarn clamp (3), said yarn monitor having a monitor needle (2) which effects deflection of the yarn, wherein a yarn (4) is arranged to be clamped by the yarn clamp between an abutment surface (9) and a cooperating clamping jaw (6) which has limited movement, said clamping jaw being under the influence of a control spring (7), whose clamping force is controllable in the clamp action range between a clamping position and an open position during the start-up of the machine by an adjusting device (8) which acts jointly on all yarn clamps (3), characterised in that the clamping jaw (6) is free from relative movement in the lengthwise direction of the abutment surface (9) during the clamping force control, and its clamping force is directed solely perpendicular to the abutment surface (9), and in that the clamping force of the control spring (7) is quantitatively controllable by a bolt (10) displaceable perpendicular to the abutment surface (9) by the adjusting device (8), with the bolt seating the control spring (7) and making axially movable contact with the clamping jaw (6).

2. Device according to claim 1, characterised in that the bolt (10) is mounted to be axially displaceable in a clamp housing (11) which includes the abutment surface (9), and extends through the movable clamping jaw (6) free from radial play.

3. Device according to claim 2, characterised in that the clamping jaw (6) has rearwardly projecting actuating lugs (13) with slots (14) parallel to the bolt, in which slots a transverse pin (15) of the bolt (10) engages.

4. Device according to one of claims 1 to 3, characterised in that the control spring (7) which acts on the clamping jaw (6) encircles the bolt (10) and is supported at its other end on the transverse pin (15) of the bolt (10).

5. Device according to one of claims 1 to 4, characterised in that the bolt (10) is subjected to the action of a clamping spring (16) which is seated in the clamp housing (11), said clamping spring holding the bolt (10) in a position in contact with the housing (11), in the clamping position of the clamping jaw (6), by overcoming the force of the control spring (7).

6. Device according to one of claims 1 to 5, characterised in that the yarn clamp (3) comprises a yarn guide element (17) which holds the yarn (4) above the bolt (10).

7. Device according to one of claims 1 to 6, characterised in that a projection (19) limiting upward vertical displacement of the yarn is provided on the abutment (5) which defines the abutment surface (9).

8. Device according to claim 7, characterised in that the projection (19) has a substantially vertically extending yarn guide edge (18) limiting deflection of the yarn perpendicular thereto.

9. Device for the start-up control of yarn creels for weaving or gathering machines, whose yarn supply stations arranged in rows and columns each have associated therewith a yarn monitor and a yarn clamp, the yarn monitor effecting deflection of the yarn by a monitor needle, particularly according to one of claims 1 to 8, with a substantially vertical yarn insertion slot formed by components of the clamp housing for a yarn to be laid into the yarn clamp, characterised in that the upper end (21) of the monitor needle (2) is arranged so as not to obstruct the slot in any possible position of the needle.

10. Device according to claim 9, characterised in that the needle end (21) is arranged above a projection (19) which limits upward vertical deflection of the yarn and is arranged on the side of the housing adjacent to the yarn insertion slot (20).

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