CS264582B1 - Yarn spinning device for friction spinning - Google Patents

Abstract

The device solves the problem of creating favorable conditions for successful spinning by measuring the optimal length of yarn and at the same time adjusting its end so that it can be easily spun into the supplied fibers. The essence of the solution lies in the fact that in the space between the rotating bodies and the waste pipe, two gripping clamps with jaws are placed, between which a separating means is arranged, consisting of a swinging segment, adjusted in an adjustable manner on a guide rod and provided with an arcuate part with a scratching surface.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn spinning device for frictional spinning of fibers which is twisted on a yarn in a wedge-shaped slot between two counter-rotating friction surfaces provided on rotary bodies of which at least one is perforated and provided inside the suction nozzle By virtue of the action and friction of the friction puffs, the sucked fibers are twisted to the open end of the forming yarn, which is continuously withdrawn from the wedge slot, and wound onto a yarn bobbin.

In this spinning process, the problem is to achieve a sufficiently strong and visually acceptable spinning yarn during spinning, thus avoiding the need for rewinding the friction yarn, which eliminates too large or too weak spinning devices by knotting or other devices.

The known hand-piecing technique in which a yarn for spinning in a friction spinning device is inserted by a hook along a wedge-shaped slot and caught in the gripper (AO 193 793) can be replaced by automatic spinning by a bypass machine. knot (DE 33 18 687) «» For normal spinning operations, however, such a device is too complicated and costly ₀ It has therefore been proposed to loosen the retained yarn in the wedge-shaped slot while spinning. rotary bodies must be threaded into the open end (DE 34 16 456). However, when the yarn break is carried out, it breaks at various points in the longitudinal wedge-shaped gap between the rotating bodies, which negatively affects both the spinning process and the quality of the yarn.

SUMMARY OF THE INVENTION It is an object of the present invention to provide favorable conditions for the successful spinning of yarn by means of such a device that can measure the optimum length of the spinning yarn in advance,

264> 82 easily spun into the filaments during the next piecing process.

The object of the present invention is to provide a yarn spinning device for frictional spinning of fibers in a wedge-shaped slot between two driven rotary bodies, comprising a gripping clamp and a separating means for catching the spinning yarn and separating and discharging its interrupted portion. In the space between the rotating bodies and the drain line there are two gripping clamps with jaws, between which a separating means consisting of a pivotable segment is arranged adjustablely slidable on the guide rod and provided with an arcuate part with a peeling surface.

According to the invention, the end of the piecing yarn to form a sufficiently strong yarn is achieved by providing the pivot segment with an arcuate portion 3 of the peeling surface.

According to one preferred embodiment, the at least one clamp is adjustable in a sliding manner on the guide rod.

In this way, an optional measurement of the length of the yarn to be spun can be achieved depending on the specific conditions of the respective spinning unit. Advantageously, an electromagnet is associated with the gripper jaw. It is also preferred that an electromagnetic device is associated with the pivotable segment.

According to a further preferred embodiment, the pivot axis of the arcuate portion of the pivotable segment is arranged transversely to the direction of movement of the withdrawn yarn.

It is also advantageous if the pivot axis of the arcuate portion of the pivotable segment is arranged parallel to the direction of movement of the yarn to be discharged. By this arrangement, short or insufficiently spun fibers are gradually removed from the entrapped yarn by the rocking movements of the segment, which is advantageous for obtaining a particularly solid spinner.

Adjustable by measuring the length of the yarn while spinning

264> «4 adjusting its end increases the reliability of the percentage of success in spinning yarns of different fineness and hence different draw speeds. Also with the device according to the invention it is possible to take into account the various dynamic properties of friction spinning units both in individual and in bulk yarn spinning, in particular regarding the nature of the reactions of the electromagnetic couplings in the respective trigger mechanisms.

The apparatus according to the invention is illustrated in the accompanying schematic drawings in which: FIG. 1 is a view of a friction spinning unit with adjustable gripper clamps and an adjustable pivot segment; FIG.

detail view of a version with a cross-swinging segment, fig. _{0 an} embodiment with an inclined swinging segment, and fig. 4 a detailed view of another embodiment with a double gripping clamp ©

The friction spinning unit 1 consists, in an exemplary embodiment, of a pair of rotating bodies 2, 3 ^{in the} form of driven rollers, of which a cylinder with a perforated friction surface 2 housed inside a cylinder with a non-perforated friction surface. 10 to a vacuum source (not shown). Both of these rotary bodies which can also be arranged side by side are closely but contactlessly abutted and enclose the wedge-shaped gap 6 for spinning fiber fed feed channel 8 ₀ for withdrawing the spun yarn 12, a draw-off rollers lj whose drive is operated by electromagnetic clutch (not shown) ©

In order to hold and adjust the end of the piecing yarn, in the space between the pair of rotating bodies 2, J and the downstream duct 11 for sucking off the interrupted portions of the yarn, the catching and separating means are provided. clamps 16a. 16b with jaws 10a. 18b and a pivot segment 14, the arcuate portion 17 of which is provided with a peeling surface 2 provided with interlocks, spikes or other peeling elements. The gripper clamps 16a, 16b and the swivel segment 14 are displaceable on the guide rails 19, 23 and secured in position by retaining screws 20, 21. The swiveling of the segment is caused by a pair of alternately excited electromagnets 24. The jaws 18a, 18b are pulled to the yarn by electromagnets 15a. , l ^ b.

204

In another embodiment (FIG. 4), the double clamp 25 is also provided with jaws 18a, 18b attracted to the yarn 12 by electromagnets 15 and 15b. The pivoting segment 14 and the double gripper 25 are slidable on the guide rail 23 _y 19 and can be locked in the adjustable position by the retaining screw 21, 20 '. The arcuate portion 17 of the pivoting segment 14 may be adapted to swing transversely (FIG. 2) or obliquely (FIG. 3) relative to the longitudinal direction of the yarn 12 mounted between the jaws 18a, 18b.

When piecing, the yarn 12 in a friction spinning unit 1 introduces eg by an unillustrated automatic piecing device by any known procedure, for example during stoppage of the rotary bodies 2, 2 ^and when stopping ^the suction of the suction nozzle 2 P ° * lon wedge 6 behind which is sucked into the waste pipe 11, which is connected to an unimpressed suction source during the spinning operation. After the yarn has been sucked into the waste pipe, its return movement is terminated and the measured part is caught between the jaws 18a,

18b of the gripping clamps 16a, 16b or the double clamps 25 '.

After the yarn has been picked up, the electromagnetic device 22 of the pivotable segment 14 is actuated to oscillate its arcuate portion 17, which by its raking surface 2 disrupts the seized yarn at a preselected location. The pivoting movement of the arc-shaped portion of the segment is due to alternating excitation of a pair of electromagnets 24 attracting its lower anchor portion (Figs. 2, 3), or by moving this portion at the break point of the magnetic circuit of the electromagnet 26 powered by alternating voltage (Fig. 4). The segment can also be performed by pneumatic means (not shown).

After the yarn 12 has been broken, further operation of the electromagnetic device 22 or pneumatic means is stopped and the electromagnetic pressure of the jaw 18b is also interrupted by disconnecting the electromagnet 15b. so that the interrupted part of the yarn can be sucked into the drain pipe 11 connected for piecing operation on a not shown vacuum source ₀ measured and adjusted for piecing yarn end remains to be captured while jaws 18a and is ready for piecing. The piecing process then proceeds in some known manner, when after starting the rotating bodies 2 _t 2 ® P ° restoration

At this point, switching off the electromagnet 15a releases the jaw 18a of the metered yarn end from being clamped while the take-off rollers 13 are in motion. During the draw-off, the yarn end is sucked into the wedge slits 6 between the oppositely moving friction surfaces 2, ⁱⁿ which they are spun into the feed fibers

As shown in FIG. 3, in this exemplary embodiment, the angled position of the knurled portion 17 of segment 14 makes it possible to adjust the loose end of the yarn 12 to be lost during the distortion, thereby achieving a suitable spinning shape. In this case, too, the yarn length that best suits the spinning conditions given by the parameters of the particular friction spinning unit 1 is measured by sliding the swivel segment 14 along the guide rail 23 and the double clamping of the clamp 25 along the guide rail 19.

The described yarn spinning device therefore creates very good prerequisites for high yarn spinning reliability while at the same time making it possible to simplify the mechanical part of the spinning automatics on the friction spinning machine, which can be limited to reintroducing the spinning yarn into the suction area 11 and its Towing & pulling away at the same time with the already measured end.

Claims (6)

SUBJECT OF THE INVENTION 264? 82 A device for yarn spinning in frictional spinning of fibers in a wedge-shaped slot between two driven rotary bodies, comprising a gripper clamp and a separating means for catching the spinning yarn and for separating and discharging its interrupted part into the waste pipe, characterized in that rotating bodies (2, 3) and discharge pipe (11) are provided with two catching clamps (16a, 16b, 25) with jaws (18a, 18b) between which a separating means is formed, consisting of a pivotable segment (14) arranged in an adjustable position on the guide rod (23) and provided with an arcuate part (17) θ a grinding surface (9) · Device according to claim 1, characterized in that the at least one clamp (16a) is adjustable in a sliding manner on the guide rod (19). Device according to claim 1, characterized in that an electromagnet (15a, 15b) is associated with the gripper jaw (18s, 18b). Device according to claim 1, characterized in that an electromagnetic device (24, 26) is associated with the pivotable segment (14). Apparatus according to claim 1, characterized in that the pivot axis of the arcuate portion (17) of the pivotable segment (14) is arranged transversely to the direction of movement of the discharged yarn (12). Apparatus according to Claim 1, characterized in that the pivot axis of the arcuate portion (17) of the pivotable segment (14) is parallel to the direction of movement of the outgoing yarn (12).