SU749781A1 - Thread-feeding apparatus - Google Patents

Description

(54) DEVICE FOR FEEDING THREADS

one

The invention relates to a device for feeding yarns of the type of thread accumulators and can be used in the knitting industry mainly for round hall and flat hall machines with variable yarn consumption in hall systems.

In order to level the tension of the thread, circular machines with variable thread consumption in threading systems use thread holders, which rewind the thread from the spools to the drum, and then feed it to the zone in the underdrive. In this case, yarn winding defects on bobbins do not affect the loop formation process, and the tension of the thread is flattened and minimized. This leads to an improvement in the structure of the web, to a reduction in the scrap and to an increase in the productivity of the machine.

A device for feeding the yarn is known in which the means for controlling the drive of the thread storage drum comprises a spring-loaded lever made in the form of an inclined ring. This device ensures reliable mixing of the threads along the drum, however, it leads to the imposition of new turns on previously wound and consequently, pulling out the thread consumed by needles from under the new turns, while the tension dramatically increases and threads 1.

With the prototype of the invention, there is a device for feeding a thread, which includes a thread storage drum, a means for controlling the drive of a thread storage drum with a spring-loaded two-arm lever and a brake brake element.

10 One arm of a spring-loaded lever is designed to interact with the means of controlling the drive, and the other for directing the thread to the drum. This shoulder has the ability to move in the direction of rotation of the drum and is made in the form of a thread 15 of a folding rod with a hook at the end 2.

The disadvantage of this device is that this displacement occurs under the action of friction forces arising

20 between the threads of the thread and the lever arm. This leads to the fact that when processing different types of yarn and threads with different coefficients of friction, the force of friction turns out to be unequal, which makes it necessary to adjust the spring of the two shoulders.

In addition, during operation of the device for feeding a yarn with one type of yarn, the frictional force also varies, since the coefficient of friction depends on the speed of movement of the yarn, the roughness of the surface of the lever, and the yarn smoothness. This causes the number of threads to be wound onto the drum to become non-permanent.

In some cases, they are wound too much, and in other cases all the turns come off the drum.

All of this reduces the reliability of the device, including the clarity of switching on and off the drive of the thread-storage drum, the uniformity and stability of the number of threads that are wound on the drum, this degrades the grade of the web, the uniformity of the hinge structure, leads to a decrease in machine productivity.

The purpose of the invention is to eliminate these drawbacks, namely, to increase the reliability of the device for feeding the yarn, i.e., to increase the clarity of switching on and off the drive of the thread-storage drum, uniformity and ensuring the stability of the number of yarns wound on the drum.

To achieve this goal, in a known device for feeding a thread containing a thread storage drum and means for controlling the drive of a thread storage drum, includes its spring-loaded lever for guiding the thread to the thread storage drum and for interacting with the contact drive system of the thread storage drum, the lever part is made as the yarn folding rod can move it in the direction of the axis of the drum, i.e. in the direction radial to the drum.

The end of the part of the lever intended to direct the thread to the thread storage drum is made in the form of a hook, bent in the direction opposite to the rotation of the drum.

In addition, in order to achieve a more complete stacking of the threads, a part of the lever intended to direct the thread to the thread storage drum is provided with a rounded protrusion in its middle zone, the outer surface of which is removed from the drum.

FIG. 1 shows a general view of the proposed device for feeding the yarn; in fig. 2 is a view along arrow A in FIG. one.

The device for feeding the thread includes a housing 1 (see Fig. 1), in which a shaft 3 is mounted in bearings 2, equipped with a pulley 4.

In the housing 1 on the shaft 3 on the bearings 5 a thread storage drum 6 is mounted with the possibility of free rotation. The hub 7 of the drum 6 is equipped with a tooth 8.

The means for controlling the drive of the stacking drum 6 is also housed in the housing 1 and comprises a spring-loaded lever 9 mounted on the axis 10. The spring-loaded lever 9 consists of two

parts: the rod II, located at a certain angle to the forming surface of the drum 6 can be rotated towards the axis of this drum and intended to direct the thread 12 to the drum b, and the arm 13 spring loaded 14

and interacting with the contact drive system of the storage drum 6.

The housing 1 houses a drive system for the thread-storage drum 6, consisting of a microswitch 15 with a button 16, with which arm 13 contacts, an electromagnet 17 with a lever 8, covering the coupling half 19, which sits on a key 20 on the shaft 3 with the possibility of free longitudinal movement and springs 21 abutting against a lever arm 18 for directing coupling half 19 towards the hub 7 of the thread-storage drum 6. The semi-coupling 19 at the bottom end is provided with a tooth 22 for engagement with the tooth 8 of the hub 7.

The end of the rod 11 of the lever 9 is made in the form of a hook 23 (see Fig. 2), bent to the side opposite to the rotation of the thread storage drum 6, the speed direction is indicated by an arrow), and the middle zone of this rod 11 is provided with a protrusion 24, the outer surface of which is removed from the thread storage drum 6 .

The braking of the thread 12, descending from the drum 6, is carried out with the help of the brake element 25, which is located on the side of the lower end of the drum 6.

The device works as follows.

The shaft 3, using a pulley 4 and a belt drive, receives continuous rotation, which is transmitted through pin 20 to half coupling 19, which under the action of its own weight and spring 21 presses against hub 7 of nitro accumulator 6, and the tooth of coupling half 19 comes into contact with tooth 8 of hub 7, and the cushioning drum 6 receives rotation.

The thread 12, coming from the reel (not indicated in the drawing), bends around the rod 11 of the lever 9 and is wound on the rotating thread storage drum 6, coming out of it through the brake element 25 k in the gate system.

Since the lever shaft is positioned at an angle to the surface of the thread storage drum 6, each turn of thread 12 laid on it tends to move downward, whereby all threads of the thread evenly settle and fit in one row on the surface of this drum.

When the drum 6 has accumulated such a number of turns of the thread 12, at which the moment created by the tension force of these turns

will be more than the moment created by the spring 14, then the rod 1 of the lever 9 will rotate clockwise towards the axis of the thread-storage drum 6, at the same moment after the rod 11 clockwise will rotate and the shoulder 13 which will release the button 16 of the microswitch 15 will turn on the electromagnet 17 which, with its lever 18, will raise the half coupling 19 by disconnecting it from the hub 7 of the storage drum 6 and the rotation of the latter stops.

When on the drum 6 the number of turns of the thread 12 decreases to. of such a value at which the moment created by the spring 14 exceeds the moment created by the tension force of the threads 12, the lever 9 under the action of the spring 14 rotates counterclockwise to its original position, while the arm 13 presses the button 16, the microswitch 15 will operate, the electromagnet 17 off, and the coupling half 19 under the action of its own weight and the spring 21 is lowered, its tooth 22 engages with the tooth 8 of the hub 7 of the thread-storage drum 6, which begins to rotate again, accumulating threads 12 on its surface.

In the process of accumulating the threads of the thread 12 on the thread storage drum 6, the lower turns of the thread 12, being upset, meet the rounded protrusion 24 of the rod 11 in its path. This will cause resistance to the movement of the turns of the thread 12, with the result that the turns located above the protrusion 24 will fit more tightly to each other. Tightly stacking of coils will allow accumulating a greater length of thread 12 on the thread-storage drum 6, and therefore turning the drum on and off will produce 6

with less, which will increase the reliability of the device.

If it is necessary to accumulate a large number of turns of the thread 12, the lower turn will be located close to the end of the rod II, but after removing it from the drum 6, the hook 23 will meet on its way, which will prevent the thread 12 from getting under the rod 11, which will prevent the thread from the cliff.

Claims (2)

1. Device for feeding the yarn, mainly to the in-hole machine, containing a driving yarn-storage drum and means for controlling the switching on and off of the drum drive, having a spring-loaded two-arm lever mounted in the housing, one arm of which is made in the form of a yarn-folding rod and the other interacts with a contact system A drive, characterized in that in order to increase reliability in operation, a two-arm lever is mounted in the housing so that its yarn-folding rod has the ability to swing into dially to the drum nitenakopitelnomu direction. 2. The device according to claim 1, characterized by by that. yarn folding rod in the middle part of the contact with turns of thread has a rounded protrusion. Information sources, taken into account in the examination 1. The patent of Sweden No. 318667, cl. D 04 B 15/48, published 1973. 2. USSR author's certificate number 519514, cl. D 04 B 15/48, 1975.