EP0725850B2 - Yarn feeding device for textile machines - Google Patents

Description

The invention relates to a thread storage and delivery device for textile machines with primarily irregular Thread consumption, such as knitting and knitting machines the patterns, jacquard, curling, plating, commute and e.g. are semi or fully plushable, with one that loosely promotes the thread by one Motor driven storage body on which the thread to form a storage supply wrap tangentially - and depending on the badarf between its as Braking surface trained end face and one in same counter-rotating surface axially rotating The counter braking surface is in axial Direction in relation to the accumulator brake surface adjustable to vary the thread take-up tension can.

A genus of known devices of this Art basically has the disadvantage that the dated Storage body thread pulled off in the axial direction by any ring-shaped, loose on the storage body seated arrangement (metal ring, plastic ring, comb-like plastic ring, brushes and the like Taking off or flying away from the storage body prevented will, however, the desired one and for a correct one Knitting process required thread take-off tension (inlet tension of the thread on the respective knitting system on the machine) the thread, although with much lower tension from the storage body than the storage body is fed for the final and most importantly knitted Inlet tension on the knitting machine system then an additional thread brake between the Storage device and the knitting machine.

This solution for setting a correct thread inlet tension is not optimal, especially with one Thread brake associated difficulties are well known: The one used in most cases Disc brake is difficult to adjust, keeps the set one Value not constant (at least not above long periods of time), shrinking, dirty and dirty, it also increases irregularities, which when pulling the thread from the storage body and when passing through the ring, ring comb or For example, an annular brush often occurs this leads to undesirable fluttering of the thread can it happen that single needles the thread does not catch, the result is an unwanted, irregular knitting pattern - the Knitting machine produces rejects.

In a known device of this type (Swiss Patent 374 345) lacks an annular Arrangement entirely, which the from the storage body keep the axially running thread on the circumference of the thread Rather, it is part of the registration that the Thread when pulling through the knitting or weaving machine forms a so-called thread balloon in order to one like that low as possible thread tension to achieve what is completely useless in practice, at least for use on conventional knitting machines.

In another known device this Genus (U.S. Patent 3,225,446), in which again on a winding body (= storage body) tangentially a thread to form a storage roll wound up and then deducted axially from this is, the thread is additionally by means of an elastic Ringes on the one hand flying away and uncontrolled Lifted from the winding body prevented and to the other a predetermined thread take-up tension is to be obtained In practice, this solution proves as not usable because on the one hand the elastic Ring with the accuracy required here and above all Long-term constancy is difficult to produce and on the other hand for each type of thread used - and thick and one for each different thread tension special design e.g. with regard to the inner ring diameter and / or its elasticity is necessary would. There is also a machine - and thread-related Fine adjustment, which experience has shown in every knitwear and throughout the production must be done again and again, not possible.

There is also a thread storage and delivery device known for textile machines of this type (German Patent 1 635 899), equipped with a Bobbin on which the thread forms a thread supply tangentially and from which it can be wound is then axially removable, by a so-called Ring traveler running along one Flange at the head end of the winding body, this runs around Another alternative is the ring traveler through a ring with a larger diameter than to replace that of the winding body. But there are also constructive difficulties because the ring must have a smaller diameter than the flange, but larger than the winding body have, moreover, the winding body only operated vertically and with the flange side down become, and there is a risk that something ring diameter too large (in relation to the Coil diameter) the ring at higher speeds to "egg" and an intended and desired consistency in the thread take-off tension is no longer guaranteed, which is why you are already here long gone on, comb-like plastic rings with different strengths for different applications But there are also here Difficulties for a correct knitting process required thread inlet tension on the machine don't adjust with the help of these plastic comb rings, the value achieved (mostly too low) is only static, i.e. unchangeable; an additional thread brake with the disadvantages already detailed must be between this device and the textile machine be attached in the thread run.

Devices of this type are also known which one separated from the storage body, in have the same direction of rotation rotating brake ring describes Japanese publication JP-93 757/1973 a thread delivery device with a through a DC - Motor driven storage body with a conical running front, on which one as a brush ring trained counter braking surface, carried by one funnel-like structures, for example at the beginning of the Center is tapered section. through a gear arrangement is driven by the storage body for a synchronous rotation of this brush ring with the storage body. In the illustrated Embodiment, the brush ends are somewhat oblique put, above all, to prevent the overhead pulled thread does not get caught in the brushes. An axial displacement of the brush ring is only for Purpose of removal from the front of the storage body intended to e.g. threading the thread too The thread take-off tension can with this Thread delivery device not selected or changed become.

Another thread delivery device with rotatable Memory body and with rotatable brake ring, however equipped with a disc Rubber ring is known from US Pat. No. 4,068,807 in this application it becomes circular Rubber part, here called elastic brake ring, held by a funnel-shaped structure or is in the funnel is rotatable stored and also carried out axially displaceable. Thereby should allow the contact pressure of the inner edge of the elastic brake ring on the conical molded end face of the storage body and thereby also vary the thread take-up tension special rotary drive for the funnel with brake ring is not provided here, so only the inevitable Friction of the inner edge of the brake ring at the point of contact all around the conical part of the storage body according to the respective contact pressure Co-rotation causes, the disadvantage here is the relative large mass of the funnel including brake ring and its storage with its friction, which depends from the specified start-up or Braking behavior of the storage body with its drive, a more or less large slip between the two rotatable parts Unscrewing the storage coil is the result and therefore an undesirable change in the course of the thread Effect can be only lessen by not excessive rapid speed changes on the accumulator occur, which in turn is the maximum delivery quantity of this Thread delivery device severely restricted, and moreover the conditions change when adjusting the contact pressure continually what a reliable function not guaranteed over a larger setting range.

The other type of known thread delivery devices is shown below using some examples explained. In the published patent application DE 25 40 749 describes a thread delivery device which a stationary, i.e. stationary storage body with a associated brake ring. The thread is via a winding device on the stationary storage body to form a storage pool tangential wound up and formed over the brake surface End face (radial ring surface) axially a brake ring as a plate-shaped housing, provided with circular approximately on the outer circumference arranged elastic, narrow long fingers, is supposed to form the counter braking surface here on the ring surface of the storage drum, that is Storage body, at an angle. With an adjusting screw the distance of the brake ring to Front surface of the storage body can be changed, which is intended with changing contact pressure also to change the thread take-off value. The main disadvantage here is the complicated and time-consuming process Manufacture of the brake ring with its myriad elastic, long narrow fingers as well the fact that this construction is by weight Problems, although due to the chosen Principle with stationary storage body and brake ring for the acceleration or braking properties of the Device not relevant, since it weighs the entire weight the brake ring on the front of the storage body, when operated in the position shown In this position, the thread inlet is at the top and the thread outlet attached to the bottom of the device but also that there is always a certain basic contact pressure due to its own weight and this with the adjusting screw actually only can still increase. Also operated in other positions, new unpredictabilities arise again. Accordingly, the setting range is the thread take-up tension this thread delivery device is severely limited.

DE 3429219 A1 describes a thread brake ring arrangement directly comparable to that in JP-93 757/1973 shown, only with the difference, so far can be seen that this is a device with a stationary Storage body and brake ring.

In GB 2005 739 a thread delivery device with a stationary storage body and one axially displaceable arranged brake ring described. In deviation of known, conventional solutions, here are the so-called brush hairs of the thread brake device embedded in the head part of the storage body and an annular axially slidable ring takes over the function of the counter braking surface. Basically taken as a result, there are no advantages over the conventional solutions, on the contrary to be expected due to the bilateral guidance / storage of the brush hair in the storage body, this thereby become relatively stiff and a sensitive attitude of the thread take-off value cannot be produced this arrangement of the brush hair favors one rapid wear in their central area, namely just where the brake ring presses the thread. Overall, the solution is with brushes or brush rings for the correct, constant and easily adjustable thread take-up tension not optimal. poor adjustment options, the elaborate Manufacturing and rapid wear are some of the main disadvantages here ..

In WO 91/14032 i.a. a thread draw brake arrangement, which with a thread delivery device works together, described which task has the thread take-off tension or thread output tension set from memory body i.e. to be able to control and this also with to provide a cleaning function, essentially this arrangement consists of two opposing, round parts, each with an annular Brake surface and between which the thread is passed through for a braking effect to achieve what is actually the function of an ordinary Disc brake equals here from that the effective diameter of the annular Braking surfaces significantly smaller than that Storage body diameter and thus the thread support - or deduction area. has been selected Design with stationary storage body, with an abrupt change in thread speed from a high to a lower value, turn up the supply wrap because the thread piece from the end of the last turn on the storage body to the point where this is between the two Brake parts is held, fails very long and it following the laws of centrifugal force, therefore from Memory body will lift off, which means that on the one hand the storage coil monitoring from kick falls, the thread take-up tension may change and / or that the unwound thread somewhere in the thread delivery device hooked or hung. Correct thread feeding to the knitting machine is not guaranteed.

The object of the invention is therefore a thread store - And delivery device of the above To create genus which the desired Features, is simple in structure and function and also in all areas of application intended for this works reliably.The thread to be processed (3) is on a rotatably mounted, slip-free conveyor Storage body (9) to form a supply reel tangentially wound and then axially (depending on Requirement) between the braking surface (9 ') Face and one rotating in the same direction and axially displaceably mounted counter braking surface deducted.

According to the counter braking surface from a circular, slightly larger in diameter than that of the storage body end face (9 '), thin, flexible disc (10) is formed. The elasticity this disc is used to make a more even one Contact pressure on each point of the front To reach the braking surface (9 ') of the storage body and that the thread through more or less strong Contact pressure more or less clamped i.e. decelerated is so that the thread take-off tension in wide Ranges is infinitely adjustable the thread prevented from flying away and an untwisting of the storage wrap prevented.

The thread is over the center of the disc (10), which has a wear-free feedthrough (25), withdrawn; the disc sits on a hub (13), which in turn is applied to a hollow shaft (17). The entire structure is centric and flat in both Levels to the storage body or its front Braking surface (9 '), rotatable and displaceable in parallel, stored.

For the function of setting the thread take-off value it’s basically immaterial whether the storage body (9) with its front braking surface (9 ') in relation to the disc (10) of the counter braking surface is moved or vice versa, or even both at the same time in relation to each other in this embodiment described here u. a. the thread guide means assigned to the storage body (5, 6, 7,) advantageous fixed with the device chassis (2) are therefore connected to the function block with the Counter braking surface preferably on one in the Slidable longitudinal axis of the storage body Carriage (26) mounted.

The slide (26), which on the device chassis (2) practically without play using a threaded spindle (16), at the end of a rotary knob (18) is slidable is mounted, also moves a pointer (15) with whose help on a clearly visible scale (27) each set thread take-off value is readable known fact that different yarns are different Have coefficients of friction, and therefore once selected setting on the aforementioned scale may change to a different type of yarn results in a different thread take-off value However, the purpose of this invention is, among others, practically everyone required value at standstill or during Set knitting machine effortlessly can, as well as this for a certain type of yarn once to hold the set value over long periods of time and this even after a change in the meantime another value to be able to reproduce again.

The disc (10) of the counter braking surface and the associated functional parts are understandable Establish an annular cover (33) protected against accidental contact at the same time extremely effectively prevents unwanted Winding the thread on the shaft of the Disc (10) of the counter braking surface, should be from which Whatever the reason, the wrap from the storage body falling, triggered e.g. due to one too low thread take-off value, so that the last thread turns of the storage reel (8) due the centrifugal forces and also the air resistance lift off the accumulator (9) at higher speeds, and the annoying and often mentioned thread balloon effect otherwise would occur.

The device according to the invention works like follows: Before starting the knitting machine, the device Switch off with switch (24). The thread to be processed (3) is through the eyelet (5), the thread brake (6), the eyelet (7) is threaded and then across the front of the storage body (9 ') and the disc (10) Counter braking surface over the center of the wear-free Implementation (25), approximately in the rear third The thread is pushed using a threading aid pulled through the hollow shaft (17) and to the designated Knitting point of the machine It is winding up a storage supply roll (8) advantageous if both on the thread infeed and outfeed side a small loop and a slightly higher one Clamping effect of the two braking surfaces is present. To do this, pull the thread after the Hollow shaft (thread outlet of the device) and then before the thread infeed of the device and with the help of Adjustment knob (18) for the thread take-off value a little higher value, usually it is enough that the pointer (15) is in the middle position on the scale (27). Then the device is switched on with the switch (19), and the one essential for trouble-free operation Storage supply roll forms automatically (provided are not described here to monitor the storage roll width, which the or the drive motors for the storage body and the Disc of the counter braking surface over a not shown Control the motor control device accordingly. To the final Adjustment of the correct thread take-off value, either becomes a known value on the scale set or a new value e.g. based on a correct one Knit piece determined.

Fig. 1 eine Seitenansicht einer erfindungsgemäßen Vorrichtung mit Gehäuseteile,

Fig. 2 eine Seitenansicht derselben Vorrichtung ohne Gehäuseteile,

Fig. 3 eine Vorderansicht dieser Vorrichtung mit Gehäuseteile,

Fig.4 die Scheibe der Gegenbremsfläche mit Nabe und Hohlwelle in Seitenansicht,

Fig 5 eine Seitenansicht eines anderen Ausführungsbeispiels teilweise in Längsschnitt, mit einem gemeinsamen Antriebsmotor für Speicherkörper und der Scheibe der Gegenbremsfläche.

The subject matter of the invention is explained in more detail, for example, with the aid of the attached schematic drawings, in which:

1 is a side view of a device according to the invention with housing parts,

2 is a side view of the same device without housing parts,

3 is a front view of this device with housing parts,

4 the disk of the counter braking surface with hub and hollow shaft in side view,

5 shows a side view of another exemplary embodiment, partly in longitudinal section, with a common drive motor for the storage body and the disk of the counter braking surface.

Figures 1 and 2 show the overall view Device once with and once without various housing covers and from the side. This kind of Device is usually by means of a bracket (1) on a handrail, which is common Has space for several devices and which in turn attached to the knitting machine nearby the knitting point to be supplied.

In Figure 2 you can see the thread through the device track well. The incoming thread (3) is through the inlet eyelet (5), the thread brake (6) and the guide eye (7) tangential to the storage body (9) introduced and on this by means of a number from turns to a storage supply roll (8) The thread is then formed between the front Braking surface (9 ') of the storage body (9) and which is circular, slightly larger in diameter than that of the storage body face, thin, flexible Disc (10) trained counter braking surface performed and clamped, and over their ceramic eyelet (25) and the central hollow shaft (17), here at the same time also drive shaft of the motor (14) for the disc of the Counter braking surface, subtracted from the outside.

The existing on the storage body (9) Storage wrap is axially between the Storage body end face (9 ') and the thin, flexible Disc (10) trained counter braking surface passed and more or less depending on the contact pressure clamped and over their ceramic eyelet (25) and the central hollow shaft (17), withdrawn from the outside.

In Figure 2 is also the sliding carriage (26), on which in this embodiment the motor (14) for driving the formed as a thin, flexible disc (10) Counter braking surface is attached, visible. Turn the adjusting knob (18) over the threaded rod (16), the carriage depending on the position on the Chassis (2), ultimately the disc (10) Counter braking surface more or less on the front Braking surface (9 ') of the memory body (9) pressed.

Figure 5 finally shows a variant with only one drive motor, the disc (10) the counter braking surface via gear wheels (34, 34 ', 34' ', 34 '' '), driven by the motor (4) of the storage body (9) becomes. Moving the disc of the counter braking surface is here instead of with a sled an adjusting screw (35) in which the hollow shaft (17) is stored.

The counter-braking surface designed as a circular, thin, flexible disc (10) can be driven directly by a speed-controlled / frequency-controlled electric motor (14) become. The counter-brake surface designed as a circular, thin, flexible disc (10) can also indirectly via a gearbox from a speed-controlled and / or frequency-controlled one Electric motor are driven.

Claims (16)

1. A yarn feeding device for yarn-processing textile machines, particularly for knitting machines and self-acting knitting machines with irregular yarn consumption, comprising a rotatably mounted storage body (9) which delivers the yarn (3) substantially without slip and which is directly or indirectly coupled to a motor (4, 14) which drives it, wherein the yarn (3), which is wound up tangentially by the storage body (9) and thereafter is pulled off overhead, i.e. axially, is passed through between the end face, which is constructed as a braking surface (8'), of the storage body and an opposing braking surface (10) which rotates in the same direction of rotation as the storage body and is axially displaceable via its mounting, so that the yarn (3) is clamped, i.e. braked, by a contact pressure of greater or lesser magnitude, so that the yarn pull-off tension is continuously adjustable over wide ranges, characterised in that the opposing braking surface (10) is constructed as a thin, circular, flexible disc (10), the diameter of which is somewhat larger than that of the end face of the storage body, and the elasticity of said disc is utilised in order to achieve a more uniform contact pressure on each point of the braking surface (8') of the storage body (9), and that at the same time the yarn (3) is prevented from flying off and the untwisting of the storage supply reel (8) is prevented.
2. A yarn feeding device according to claim I, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), is driven directly by a speed-controlled/frequency-regulated electric motor (14).
3. A yarn feeding device according to either one of claims 1 or 2, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), is driven indirectly, via a transmission, by a speed-controlled and/or frequency-regulated electric motor.
4. A yarn feeding device according to any one of claims 1 to 3, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), is driven indirectly in conjunction by the main drive (4), via gearwheels (34, 34', 34'', 34''').
5. A yarn feeding device according to any one of claims 1 to 4, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), substantially consists of a wear-resistant material such as a thin, flexible synthetic material or a metal sheet.
6. A yarn feeding device according to any one of claims 1 to 5, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), has a wear-resistant coating on its side facing the braking surface of the storage body (9').
7. A yarn feeding device according to any one of claims 1 to 6, characterised in that the shaft for the drive of the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), is a hollow shaft (17).
8. A yarn feeding device according to claim 7, characterised in that the yarn (3) is passed, i.e. is pulled off, centrally through the hollow shaft (17) of the opposing braking surface, which is constructed as a thin, circular, flexible disc (10).
9. A yarn feeding device according to either one of claims 7 or 8, characterised in that the hollow shafts (17, 17') are the drive shafts of electric motors (14, 4).
10. A yarn feeding device according to any one of claims 1 to 9, characterised in that the braking surface (9') on the face of the storage body (9) is in axial alignment with the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), i.e. their centres lie on a line.
11. A yarn feeding device according to any one of claims 1 to 10, characterised in that the braking surface (9') on the face of the storage body (9) can be displaced in its axial direction, directly or via its mounting, in relation to the opposing braking surface, which is constructed as a thin, circular, flexible disc (10) and which is mounted on a shaft (17).
12. A yarn feeding device according to claim 11, characterised in that both the shaft (17) and the braking surface (9') on the face of the storage body (9) are disposed so that they can be displaced in their axial direction in relation to each other.
13. A yarn feeding device according to any one of claims 1 to 12, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10) has a wear-free lead-through (25) in its centre.
14. A yarn feeding device according to any one of claims 1 to 13, characterised in that the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), including parts which are attached rotationally fixed thereto, is completely or partially covered by an annular part (33).
15. A yarn feeding device according to any one of claims 1 to 14, characterised in that the slide (26), which is displaceably disposed on the chassis (2) and which bears, via the hollow shaft (17), the opposing braking surface, which is constructed as a thin, circular, flexible disc (10), can be sensitively adjusted by associated adjusting means (18), with the aid of an arrangement comprising a toothed rack or threaded rod (16), and can be locked in any desired position within the requisite total travel in order to cover the requisite range of adjustment.
16. A yarn feeding device according to any one of claims 1 to 15, characterised in that means are associated with the device for making the relative movement of the opposing braking surface, which is constructed as a thin, circular, flexible disc (10) and which is rotatably mounted on the slide (26), towards the braking surface on the face of the storage body (9'), and thus what is termed the braking or clamping effect, and ultimately the yarn pull-off tension which results therefrom, visible on a scale (27), e.g. by means of a pointer (15).

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