DD143439A5 - THROUGHPUT TRAY FOR CONTINUOUS SPINNING MACHINES - Google Patents

Description

Pulling drafting device for continuous spinning machines Anwendungsgebet the, invention

The invention relates to a draft-drafting system for continuous spinning machines for natural and synthetic fibers.

Characteristics of the known technical solutions

For the production of a yarn by means of continuous spinning machines, the yarns coming from a bobbin are in a final step combined strand-shaped into a yarn, which after stretching these threads is thinner and more durable than the previous strand »

This last step is carried out mechanically by means of a drafting train comprising pairs of cylinders between which the cross-section of the strand coming from the bobbin is progressively reduced until it is fed by means of a pair of discharge cylinders to a rotor which, when rotating about its vertical axis, turns each revolution Spinning the yarn causes.

- 2 - Berlin, d.3.9.W9

, AP D01H / 212 649. ' 55 479 26

The reduction of Garnquersehnitts is achieved by different speeds of each pair of cylinders pressed together, so that the previous pair of cylinders retains the fibers under pressure and the following pair of cylinders acts on the fibers at a higher speed, whereby at constant time supplied amount of material a cross-sectional reduction is achieved the GesGhwindigkeitsverhältnis the first or _e second. Cylinder is inversely proportional «,

Between the first and the middle cylinder pair, this retention is effected by pressing the upper guinmi-coated cylinder onto the lower steel cylinder. This necking is usually known as a preliminary stretch,

Between the middle and the outlet cylinders, in addition to the retention by applying a pressure at their points of contact, the strand is guided between two elastic bands which move at the speed of the middle cylinders *

In this way, in this zone, a further reduction in cross-section is achieved, which is known as the main extension. "The product of the values of the pre-stretch and the main extension is known as the total extension." The main drawback of this method is the fact that even with the most accurate setting to achieve the desired stretch frequent thread tears at the entry zone to Kötzer occur, which have their cause in the

2 6 4 9 - 3 - Berlin, 3.9.1979

AP D01H / 212 649 55 479 26

- temperature and humidity fluctuations of the environment}

- immature fibers, if they are vegetable fibers; -. excessive electrostatic stress on synthetic fibers and their mixtures;

Bad condition of the rubber coating of the upper cylinders, e.g. Damage, cracks, etc .; and

- "The appearance of excessive fiber dust.

When the draft-drafting system is pressurized to reduce the fiber cross-section, the reasons given above, as the paser passes through, result in the fiber winding around the two outlet cylinders. "

This winding can, depending on the frequency, lead to the degradation of the components as well as the fiber quality.

On the other hand, it is difficult to monitor a machine by continuously observing each of the 400 yarn strands. D _e h. That the winding inevitably leads to loss of production, "which have a corresponding economic impact.

Since the windings on the exit cylinder have acquired a certain density and strength, a separation process must be used which often leads to fractures and the destruction of the rubber coatings, which in turn leads to increased spare parts and repair costs and machine downtime.

There are therefore means for automatically releasing the pressure necessary, and if so before

Berlinjd.3.9.1979 AP D01H / 212 649 55 479 26

mentioned winding of the fibers takes place,.

For this purpose, there are devices that operate with light rays and photocells at the exit of the yarn, whereby a device is controlled, which cuts off the fiber strand before it enters the first press cylinder.

Another, also known system detects a thread breakage by means of a tactile wire, which rests permanently on the thread strand "so that in a crack, an electrical contact is made, by the Rückhalt.des.Strangs is effected before its entry into the first Preßzylinder«

The aim of the invention is to prevent the material losses occurring at the draft-drafting system *

JJP ß. QflgL the invention

The object of the invention is the "task to interrupt by automatically canceling the pressure of the drafting drafting the supply of the fiber strand ,,

According to the invention, on the axis of the upper cylinder located at the exit of the drafting draft, is a sensing element for sensing the fiber accumulation caused by the increase in the upper and lower cylinders and for releasing the fibers by relieving the pressure between the upper and lower cylinders arranged.

21 2 6 A 9 " ³ - Berlin, December ³ , 1979

AP D01H / 212 649

55 479 26

This advantageously draws attention to the error by "raising the arm visible from each point of the machine

In a further advantageous manner, the arm is raised exactly at the correct time and the pressure is released, so that excessive pressure and consequent chafing and damage to the components are avoided.

A further advantage of the invention is to prevent breakage of the belt tensioner which occurs as a side effect of braking the belt or lower belt against the guide profile due to the increase in the diameter of the lower exit cylinders upon winding of the fibers.

Finally, with the invention, the yarn quality can be kept constant, which is normally changed by the displacements due to the eccentricity artificially generated by the winding of the fibers on one of the coatings of the upper cylinder or the lower steel cylinder.

In one embodiment of the present invention, the frame carrying the upper part of the draft-drafting system is articulated to a component with which pressure can be transmitted to the lower part of the draft-drafting system, one or more springs being arranged between this component and the frame move the upper part away from the lower part of the drafting system »*

- 6 ~. Berlin, d, 39.1979

AP D01H / 212 649 55 479 26

According to a further embodiment of the invention, the sensing element for sensing the increase in diameter of the cylinder comprises a clevis lever whose shaft is articulated at an articulation point on the frame of the upper cylinders of the drafting drafting device and the sensing element near the outgoing cylinder on the axes of the cylinder and that the middle part of the clevis lever comprises a length adjustable screw forming a pawl coupling element, the pawl being hinged and spring biased to the upper cylinder frame and having a shaft lockable or releasable therewith, whereby the pressure exerted by the upper cylinders on the lower cylinder pressure can be canceled, and wherein the action of the shaft is supported by mechanical, electrical, pneumatic or by means of combined devices _e

The invention will be explained in more detail below an.einem embodiment. The accompanying drawings show j

1 is a schematic representation of the arrangement of the components of a continuous spinning machine;

Fig. 2% shows a draft drawing system for a continuous spinning machine.

On the bobbin A (Fig, 1) is made of multi-fiber fiber strand, the bobbin A is. A consisting of three pairs of cylinders draft drafting B downstream of which in a known manner the rotor 0

12 6 4 ^ -7- Berlin, d, 3.9.1979

_ AP D01H / 212 649 55 479 26

2 shows a scanning element 2 arranged on the axes of the upper cylinder 1 located at the outlet of the drafting system B and which responds to the increase in the center distances between the upper cylinders 1 and the lower cylinders 3. The frame 4 which carries the upper part of the drafting drafting device B, is articulated to the component 5, which transfers the pressure to the lower cylinders 3 of the drafting drawbar B. Between the component 5 and the frame 4, one or more springs 6 are provided, which cover the upper part of move away the lower part of the drafting drafting B when the locking lever 7 is released.

The sensing element 2 comprises a lever with fork head, whose shaft is articulated to articulation points 8 of the frame 4 of the upper cylinder of the drafting drafting B.

The lever with clevis of the scanning element 2 has for the at the exit of the drafting drafting B located cylinder 1 projections 9 which rest on the axes of these cylinders and the scanning element 2 for sensing the increase in diameter at the upper or lower cylinder 1; 3 record.

The middle part of the lever with clevis of the scanning element 2 is provided with a screw forming a stop 10, which is an actuating plate for a locking element 11, which is biased by a spring 12 biased to the frame 4 of the upper cylinder 1 and a shaft 13 locks or releases, which acts against the locking lever 7, whereby the pressure between the upper cylinder 1 and the lower cylinders 3 can be released. *

919 ^ 19 ~ ⁸ ~ · Berlin, _e 03/09/1979

55 479 26

D _e r'U-shaped clevis of the lever of the scanning element 2 rests with the two lower ends on both sides of the axis of the upper cylinder 1 in the vicinity of the rubber coverings.

The sensing element 2 is hinged at its rear so that the smallest lift generated by the upper cylinder 1 produces an increased displacement of the highest part. This highest part is a screw 10 with a corresponding nut for setting the best trigger point of the system for release of the arm.

The screw 10 presses on a pawl 11, whose lower end causes the locking of a shaft 13 and which is biased by a spring 12,

The movement of the standing under the pressure of the spring 14 shaft 13 in the direction of the locking lever 7 is prevented by the latched pawl.

In the connecting axis of the above-mentioned pawl 11, a spring 12 is arranged, by means of which the pawl and the sensing element 2 is pressed against the screw 10, whereby a permanent contact of the sensing element 2 and the cylinder 1 is ensured *

The fiber strand passes from the bobbin A in the drafting drafting system B, in which a reduction of the cross-section continuously takes place until the set cross section is reached * From the drafting drafting B the fiber strand passes over a pair of cylinders 1; 3, which form the outlet cylinder pair D, become a runner C * eggs

2 649

- 9 - Berlin, d.3 * 9.1979 AP D01H / 212 649

55 479 26

The fibers are spun with each revolution of the rotor C by being twisted at each revolution (FIG. 1). During operation, the sensing element 2 scans the diameter of the upper cylinders 1 and lower cylinders 3. If SiGh increases its diameter due to the accumulation of the yarn ρ, the upper cylinder 1 is raised. Thus, the sensing element 2 is raised and pushes with the screw on the pawl 11, the lower end of the locking position on the shaft 13 is moved out. Thus, the pawl 11 releases the shaft 13 and this suddenly moves upwards. The entire energy of the spring 14 acts on the locking lever 7, which causes the release of the upper part of the Dürzugzugstreckwerks B, whereby this is moved upward, and thus the pressure between the upper cylinders 1 and the lower cylinders 3 picks up,

From the description, the following advantages of the invention result:

a) The loss of material in the form of yarn strands is through

Interrupting the feeder prevents the pressure of the extension arm from being automatically released «

b) Due to the release of the pressure of the extension arm, the main lever is raised, which makes it possible to correct the error and can be corrected in a very short time since the raised arm is seen from every point of the machine.

c) With the described device a complete release of the extension arm is effected, whereby uncontrolled excessive pressures and. caused by this scouring or damage to the machine parts can be prevented ».

912 6 49 ~ ¹⁰ ~ Berlin, d.3.9.1979

^Z AP D01H / 212 649

55 479

d) Heretofore, the increase in the diameter of the lower exit cylinder as a result of the winding of the fibers resulted in a higher pressure and corresponding deceleration of the belt against the guide profile, causing the belt to elongate or tear. "This belt breakage also resulted in failure of the belt tension element. These disadvantages are also eliminated with the present invention.

e) Taking into account that the pressure arm applies the pressure to the centers of the upper cylinders, and a yarn is produced at both ends of the upper cylinders, the winding of the fibers on the coating of the upper cylinder or on the lower steel cylinder gives rise to displacements due to the eccentricity of the rotation system, resulting in corresponding loss of quality of the yarn, which is obtained in the meantime on the cylinder, since the release of the arm does not take place and the draft is not stopped. These disadvantages are also remedied by the invention. «

f) The draft drafting device according to the invention has a simple and inexpensive construction »

g) The draft-drafting system is characterized by high operational reliability β

h) The draft-drafting equipment can easily be mounted on continuous spinning machines on the market.

Claims (1)

212 049 "^ ¹ " * Berlin, October 2, 1979 AP D 01 H / 212 649 55 479/26 Claim for a claim A drafting device for continuous spinning machines for natural and synthetic fibers, characterized in that on the axis of the upper cylinder (i) located at the outlet of the drafting system (B) is a scanning element (2) for sensing the increase in diameter caused by fiber accumulation of the upper one and lower cylinder (1; 3). and for releasing the fibers by releasing the pressure between the upper and lower cylinders (1; 3). 2. pulling drafting system according to item 1, characterized in that the frame (4) carrying the upper part of the drafting drafting system (B) is articulated on a component (5) with which pressure can be transmitted to the lower part of the draft drafting system (B), and that between the component (s>) and the frame (4) one or more springs (6) are arranged, which move the upper part of the lower part of the drafting drafting (B) with open pawl (11). The drafting system according to items 1 and 2, characterized in that the sensing element (2) for sensing the increase in diameter of the cylinders (1; 3) comprises a lever with a clevis, the shaft of which is articulated at an articulation point (8) on the frame (4) the upper cylinder (1) of the drafting drafting device (B) is hinged, that the sensing element (2) near the at the outlet located cylinder (1) on the axes of the cylinder (1) resting: ι projections (9), and that the central part the lever with fork head a length adjustable, a coupling element for a -30ΚΤ.Ϊ97 9 * 81513 £ 6 49 T ¹² "" Berlin ^ d.3.9.1979 AP D01H / 212 649 55-479 26 Pawl (11) forming screw (10), wherein the pawl (-11) on the frame (4) for the upper cylinder (1) articulated and spring-biased and with it a shaft (13) is lockable or releasable, whereby the The pressure exerted on the upper cylinders (1) on the lower cylinders (3) can be canceled, and the action of the shaft (13) can be assisted by mechanical, electrical or pneumatic means. For this ... Q / ... soap drawings