US3673649A

US3673649A - Yarn feed control means

Info

Publication number: US3673649A
Application number: US2571A
Authority: US
Inventors: Jirl Havlas; Premsyl Kostelecky; Jaroslav Sedlarik
Original assignee: Elitex Zavody Textilniho
Current assignee: Elitex Zavody Textilniho
Priority date: 1969-01-20
Filing date: 1970-01-13
Publication date: 1972-07-04
Anticipated expiration: 1989-07-04
Also published as: GB1286364A; FR2028724B1; CH510579A; JPS4920254B1; FR2028724A1; DE2000555A1

Abstract

Apparatus for automatically controlling the feeding of yarn into yarn supply magazines whereby to form a sufficient yarn supply in the yarn magazine for knotting together the two yarn ends, upon their breakage, without stopping the machine. The apparatus of the invention employs an adjustable sensor mounted upon the magazine, means for feeding yarn into the yarn supply magazine and means responsive to the sensor for feeding yarn into the magazine upon the attainment of a predetermined desired volume of yarn in the magazine. The apparatus of the invention responds to the completion of the filling of the yarn supply in the magazine, as well as responding to fluctuations of the volume of said supply, with a minimum delay.

Description

United States Patent Havlas et al.

14 1 July4,l972

[54] YARN FEED CONTROL MEANS [73] Assignee: Elitex Zavody textilniho strojirenstvi generalni reditelstvi, Liberec, Czechoslovakia [22] Filed: Jan. 13, 1970 [21] Appl. No.2 2,571

- [30] Foreign Application Priority Data Jan. 20, 1969 Czechoslovakia ..338-69 52 u.s.c|....'. ..28/1.7

[51] Int.Cl. ..D02q1/12 [58] Field of Search ..28/1.6, 1.7, 21, 72.14; 226/26 [56] References Cited UNITED STATES PATENTS 2,634,596 4/1953 Pendleton et al. ..28/l.7 X 2,734,229 2/1956 Shattuck ..28/l.7 2,760,252 8/1956 Shattuck...,.. .....28/1.5 2,960,730 11/1960 Shattuck ..28/1.7

3,166,821 l/l965 Furlong ..28/1.7 3,174,206 3/1965 Mattingly et al... ..28/l .7 3,200,466 8/1965 Duga et al .211/1 .7 3,353,242 ll/l967 Schrader ..2s/1.7

FOREIGN PATENTS OR APPLICATIONS 1,495,062 4/1967 Francc ..2x/1.7

Primary Examiner-Louis K. Rimrodt AlmrneyArthur O. Klein 157] ABSTRACT Apparatus for automatically controlling the feeding of yarn into yarn supply magazines whereby to form a sufficient yarn supply in the yarn magazine for knotting together the two yarn ends, upon their breakage, without stopping the machine. The apparatus of the invention employs an adjustable sensor mounted upon the magazine, means for feeding yarn into the yarn supply magazine and means responsive to the sensor for feeding yarn into the magazine upon the attainment of a predetermined desired volume of yarn in the magazine. The apparatus of the invention responds to the completion of the filling of the yarn supply in the magazine, as well as responding to fluctuations of the volume of said supply, with a minimum delay.

6 Claims, 8 Drawing Figures PATENTEDJuL 4 I972 SHEET 2 [IF 4 PATENTEDJUL '41s? 3. 673.649

sum snr 4 ATTORNEY PATENTEDJUL "4 I972 3 673 .6349

saw u or 4 ATTORNEY YARN FEED CONTROL MEANS The present invention relates to a device for automatically controlling the feeding of yarn into a yarn supply magazine in textile machines and more particularly to a device in which the feeding of the yarn being processed may be interrupted without interrupting the operation of said machine.

In the device according to the said invention, the feeding of yarn being processed may be interrupted without interrupting the operation of said machine. The device is based upon the principle of forming a sufficient yarn supply in the yarn magazine for knotting together the two yarn ends, upon their breakage, without stopping the machine, i.e. in the course of the normal operation of said machine.

In view of the fact that the withdrawal speed of the yarn is approximately of the order of 1,000 meters per minute, it is necessary to form the yarn supply by feeding yarn into it at a speed which is higher by at least 10 percent. It is obvious therefrom that it is necessary to stop any further feeding of the yarn into the yarn supply at the moment at which the yarn supply is full and it is necessary, therefore, to have a sufiiciently sensitive device with a minimum response delay for performing this function. These conditions, however, have not been fulfilled in hitherto known yarn supply devices.

The invention has among its objects the overcoming of the said disadvantages and providing a device which responds to the completion of the filling of the yarn supply in the magazine, as well as responding to fluctuations of the volume of said supply, with a minimum delay. The invention accomplishes such results, generally speaking, by providing a device which comprises an adjustable sensor mounted on the magazine and connected to means for interrupting the means for feeding yarn into the yarn supplymagazine.

Various embodiments of the device according to the present invention in form of example are described in the following specification and shown in the accompanying drawings, of which FIG. 1 schematically illustrates one embodiment of the present invention in side view section;

FIG. 2 shows a modification of the device as shown in FIG. 1 in side'elevation section;

FIG. 3 schematically illustrates a further embodiment of the device according to the present invention in side elevation section;

FIG. 4 is a diagram of a modification of the embodiment of the device as shown in FIG. 3 in side elevation section;

FIG. 5 is a diagram of another embodiment of the device according to the present invention in side elevation section;

FIG. 6 is a diagram of a modification of the embodiment of the device as shown in FIG. 5 in side elevation section;

FIG. 7 is a diagram of a further embodiment of the device according to the present invention in side elevation section; and

FIG. 8 is a diagram of the modification of the embodiement of the device as shown in FIG. 7 in side elevation section.

As apparent from the above, there are shown and described herein eight different illustrative embodiments of the invention. Similar parts are designated by the same reference characters throughout the several views.

The device according to the present invention shown in FIG. 1 consists of a bottom 9, mounted at the exit of a magazine 8, which is provided at its inlet with an ejector 8', said ejector being connected to a source of pressure air (not shown) by means of which the yarn 19 is tensioned upon being fed into the magazine 8. A tow-arm lever 10 is mounted swingably about a pivot in a frame 10'. The two-arm lever 10 is provided on one arm with an adjustable weight 11 and on the other arm with a permanent magnet 12, said magnet being in slidable contact with a magnetically operated reed type relay switch 13, which is mounted behind the frame 10'. The contacts of the relay switch 13 are connected to a power source (not shown) and through a relay 13' to an electromagnet 14, the core 14 of which is surrounded by a coil compression spring 14". The core 14' is provided on its outer end with a yarn guide 18, in which the yarn 19 is located. The yarn guide 18 is mounted below a set of

feeding rollers

5,6 which are in mutual contact. At least one of said

rollers

5,6 is driven from a driving source (not shown).

In the embodiment as shown in FIG. I, the yarn 19 is withdrawn from the supply bobbin 1 and passes over guiding roller 2, through a brake 3 and over a guiding roller 4, thereafter passing through the guide 18 and being fed by means of the pair of

feeding rollers

5,6. The yarn then passes over a guiding roller 7 and into the ejector 8' located at the inlet of magazine 8. The yarn in said magazine constitutes a plug which is pressed against the bottom 9 of magazine 8 and is withdrawn therefrom in the form of yarn 19 over a conventional (not shown) winding drum and on to a bobbin not shown. The bottom 9 acts against the pressure of the plug; the bottom is always located at a certain distance from the end of the magazine 8, for the purpose of enabling a continuous withdrawal of yarn 19 towards the wound bobbin, by the action of the weight 11 mounted on one arm of the two-arm lever 10, said bottom 9 being connected therewith. As soon as the pressure of the yarn plug in the magazine 8 acquires a higher level than the force exerted on the bottom 9 by the weight 11 (such force is usually chosen such as to be that reached by the kind of yarn to be processed upon filling the magazine 8); at that time the bottom 9 swings out in the direction of arrow S; two-arm lever 10 swings with the bottom, thearm of said lever carrying the permanent magnet 12 is swung out in the direction of arrow 8,. The magnet 12 is thus displaced along the relay switch 13 into a position, at which the contacts of the said switch are closed. Thereupon, the electromagnet 14 is energized through relay 13, said electromagnet drawing the core 14' into the solenoid coil (to the right) against the action of spring 14" the yarn guide 18 with the yarn 19 is thus moved in the direction of arrow 5,, whereupon the yarn is pulled axially along the

feeding rollers

5,6 and out of contact therewith. In this situation, the yarn 19 is held in tensioned state by the ejector 8', into which air continues to be still admitted. As soon as the yarn supply in the magazine 8 decreases in volume, in consequence of its continuous withdrawal to the wound bobbin (not shown), the yarn column stops pressing against the bottom 9, i.e. the force of the yarn column against the bottom is continuously reduced until a value is achieved which is lower than the force of the weight 1 l. Thereupon the bottom 9 returns to its original position and simultaneously therewith the two-arm lever 10 returns to its original position. Consequently, the permanent magnet 12 is also returned into its original position, whereupon the contacts of the relay switch 13 are opened and thus the feeding of power to the electromagnet 14 is interrupted. This releases the core 14 together with the yarn guide 18, which are returned under the action of the spring 14" into their original position; the yarn. 19 in the yarn guide 18 is returned between the

feeding rollers

5,6 by being presented to one end of the rollers, the rollers then again feeding said yarn 19 again into the magazine 8.

A modification of the embodiment of FIG. 1, shown in FIG. 2, has the contacts of the relay switch 13 connected on one hand to a power source (not shown) and on the other hand to a solenoid 15 which is connected to a supply 15 of pressure air from a pressure source (not shown). The solenoid 15 is connected by a conduit 15" with a pneumatic cylinder 16, to the position of which a rod 17 is afi'ixed, said rod being surrounded by a coil compression spring 17' and provided at its left hand end with a yarn guide 18, in which the yarn 19 to be processed is held. The guide 18 is mounted below the

feeding rollers

5,6, which are in mutual contact and at least one of them being driven from a drive source (not shown).

In the apparatus of FIG. 2, the solenoid 15 opens the supply 15 of pressure air upon the closing of the relay switch 13. Thereupon the pressure air is fed through the conduit 15 into the pneumatic cylinder 16 so as to; act upon the piston of such cylinder. The piston rod 17 and the yarn guide 18 and the yarn 19 are thus displaced in the direction of arrow S so as to pull the yarn out of engagement with the

feeding rollers

5,6. The

yarn 19 is held in tensioned state by the action of the air fed continuously into the ejector 8. After a decrease of the yarn supply in the magazine 8 due to its continuous withdrawal to the wound bobbin, the yarn plug stops pressing against bottom 9 which, together with the two-arm lever 10 and the permanent magnet 12 mounted on one of the arms of the said lever, is returned into its original position. The contacts of the relay switch 13 are thus opened to interrupt the feeding of power to solenoid 15;the solenoid 15 then closes the inlet 15 of the pressure air, whereupon the pneumatic cylinder 16 and the conduit 15" are de aerated in a known manner. Thereby the piston of the cylinder 16 and the rod 17 of said piston are returned, together with yarn guide 18 into their original position by means of spring 17, whereupon yarn 19 is returned to be disposed between the feeding

rollers

5,6 which again feed said yarn into the magazine 8.

A further embodiment of the device according to the present invention is shown in FIG. 3. In FIG. 3 the bottom 9 of magazine 8, which is provided at its inlet with an ejector 8', is mounted as in FIGS. 1 and 2, on a two-arm lever 10 which is pivotally mounted on a pivot on frame 10'. The two-arm lever 10 is provided on one of its arms with an adjustable weight 11 and on the other arm with a permanent magnet 12 which is in slidable contact with a reed type relay switch 13 mounted behind the frame 10'. The contacts of the relay switch 13 are connected on one hand to a power source (not shown), and on the other hand through a relay 13' to an electromagnet 14, the core 14' of which is surrounded by a coil compression spring 14" and is connected at its outer end to one of the

feeding rollers

5,6.

' In the embodiment as shown in FIG. 3, the electromagnet 14 is energized through the relay 13' upon the closing of the relay switch13 by means of the magnet 12 when the two-arm lever 10 is swung out in the direction of arrow S in consequence of the overcoming of the force of weight 11 by the yarn plug in the magazine 8. Said electromagnet 14, .upon

being energized, draws the core 14', in the direction of arrow S against the force of spring 14'. Thereupon, the feeding roller connected to core 14' is withdrawn in the direction of arrow S thus pulling it out of engagement with the other feeding roller. Consequently, the feeding of yarn 19 into the magazine 8 is interrupted and the yarn 19 is held in tensioned condition by action of air fed into the .ejector 8'. After decrease of the volume of supply yarn 19 in the magazine 8, dueto its continuous withdrawal to the bobbin, the bottom 9 is returned, together with the two-arm lever 10 and the permanent magnet12 mounted on one of its arms, into their original position, whereupon the contacts of the relay switch 13 are opened and the feeding of power into the electromagnet 14 is interrupted. Said electromagnet thereupon releases the core 14", which is returned by the action of spring 14" into the original position, carrying with it the feeding roller connected to it, the two

feeding rollers

5,6 thus being again in engagement and again feeding the yarn 19 to the magazine 8.

A modification of the embodiment as shown in FIG. 3 is shown in FIG. 4..In FIG. 4 instead of an electromagnet, a solenoid 15 is used, to which a supply 15' of pressure air from a source (not shown) is connected. The solenoid is connected by means of a conduit 15 to a pnuematic cylinder 16, to the piston of which a rod 17 is affixed. The piston rod is surrounded by a coil compression spring 17 which is connected with one of its ends to one of the two

feeding rollers

5,6. In the apparatus of FIG. 4, the solenoid 15 is activated upon closing the relay switch 13, said solenoid opening the inlet of pressure air 15 whereupon said pressure air is fed through the conduit 15" into the pneumatic cylinder 16, acting with its pressure upon the piston. The piston is displaced, together with the rod 17 and the feeding rollerwhich is connected to the said rod, to the right against the action of spring 17', in the direction of arrow S,, whereupon the'feeding roller 5 is pulled out of engagement with the other feeding roller. The feeding of yarn 19 into the magazine 8 is thus interrupted and the yarn 19 is held in a tensioned state by the action of the air fed continuously to theejector 8'. Upon decrease of the volume of the yarn supply in the magazine 8 due to the continuous withdrawal of yarn 19 to the wound bobbin, the bottom 9 of magazine 8 is returned, together with a two-arm lever 10 and the magnet 12 mounted on one of the arms of said lever, into their original position, whereupon the relay switch is opened and the solenoid 15 closes the inlet 15' of pressure air. The pneumatic cylinder 16 is de-aerated together with the line 15" in a known manner, whereupon the piston of cylinder 16, together with the rod 17 and the feeding roller which is connected to said rod, are returned by spring 17' into their original position. Thereby also the displaced feeding roller is returned to its original position, i.e. into engagement with the other feeding roller, thus continuing the feeding of yarn 19 into the magazine 8.

A further embodiment of the device according to the present invention is shown in FIG. 5. In this embodiment, photocells 20', 21' are used together with respective cooperating

light sources

20, 21, mounted beside each other at the inlet of the yarn magazine 8, which is provided, as before, at the inlet with an ejector 8'. The magazine 8 is provided with a transparent sidewall, so that light from

light sources

20, 21 falls upon the respective photocells 20', 21 in the absence of an intervening part of a yarn column in the magazine. The

photocells

20, 21 are connected through the relay 13 with an electromagnet 14, the core 14' of which is surrounded by a coil compression spring 14" and is provided at its outer end with a yarn guide 18, in which the yarn 19 to be processed is held. The yarn guide is mounted below the pair of feeding

rollers

5,6 which are in mutual contact and of which at least one is driven from a drive source (not shown).

In the embodiment as shown in FIG. 5, the yarn 19 is withdrawn from the bobbin 1 and guided over the guiding roller 2, passes through the brake 3, over the guiding roller 4 and through the guide 18 to between the feeding

rollers

5,6. It then passes over the guiding roller 7 and the ejector 8' into the magazine 8, where it is laid in form of a yarn plug. The yarn is withdrawn from the other end of said magazine 8 in the form of yarn 19 to a wound bobbin (not shown). As soon as the yarn plug in the magan'ne 8 grows to such extent, that its end is situated at the level of the

light sources

20, 21 and the

respective photocells

20, 21 at the inlet of magazine 8, the relay 13' is switched on by interruption of the light beam of the

light sources

20, 21, said relay actuating the electromagnet 14, which draws the core 14' against action of spring 14" together with the guide 18 in the direction of arrow S whereby the yarn 19 is displaced from between the feeding

rollers

5,6 and is held in tensioned condition by the action of air fed continuously into the ejector 8. As soon as the yarn supply in the magazine 8 is reduced due to the continuing withdrawal to a wound bobbin (not shown), the end of the yarn plug in the magazine 8 advances in the direction of withdrawal of yarn 19 from the magazine 8. As soon as the end of the plug is outside the level of the

light sources

20, 21 and the pertinent photocells 20', 21, the renewed light beam falling onto the photocells 20', 21 interrupts the relay 13', whereupon the feeding of power into the electromagnet 14 is interrupted. Said electromagnet l4 releases the core 14', which together with the guide 18, is returned by spring 14" into its original position, the yarn 19 being thus again positioned between the feeding

rollers

5,6 and the feeding of yarn 19 into the magazine 8 thus being resumed.

A modification of this embodiment is shown in FIG. 6; there the electromagnet 14 is replaced by a solenoid 15, to which is connected a supply 15' of pressure air for a pressure air source (not shown). The said solenoid 15 is connected by a conduit 15" to a pneumatic cylinder 16, on the piston of which a rod 17 is mounted. Rod 17 is surrounded by a spring 17' and is provided at its end with a yarn guide 16, in which the yarn 19 to be processed is held. Said guide .18 is mounted below the two

feeding rollers

5,6 which are in mutual contactand. of which at least one is driven from a drive source (not shown).

In the modification according to FIG. 6, the solenoid 15 is actuated upon interruption of the light beam-between the

light sources

20, 21 and the pertinent photocells 20', 21, said solenoid opening the inlet 15 of pressure air, which is fed through the conduit 15" into the pneumatic cylinder 16. Pressure air upon acting on the piston of rod 17 is displaced, together with the guide 18, in the direction of arrow S against the action of spring 17. Rod 17 in this manner displaces the yarn 19 from engagement with the

feeding rollers

5,6; the feeding of further yarn supply into the magazine 8 is thus interrupted. The yarn 19 is held in tensioned condition by the action of air continuously fed into the ejector 8. After reducing the yarn supply in the magazine 8 due to continuing yarn withdrawal to the wound bobbin, the light beams of the

light sources

20, 21 act upon the pertinent photocells 21', whereupon the inlet 15' of pressure air is closed by solenoid 15; the pneumatic cylinder 16, together with the conduit 15", is de-aerated in a known manner, so that the piston of cylinder 16 and the rod 17 with the yarn guide 18 are pressed by action of spring 17' into their original position. The yarn 19 is thereby brought again between the feeding

rollers

5,6 and the feeding of a yarn supply into the magazine is resumed.

A further embodiment of the device according to the present invention is shown in FIG. 7. In this embodiment, photocells 20', 21' with the pertinent

light sources

20, 21 are again used. The photocells 20', 21' are connected through a relay 13' with an electromagnet 14, the core 14' of which is surrounded by a spring 14" and is connected with one of the two

feeding rollers

5,6.

In the embodiment as shown in FIG. 7, the relay 13' is switched on, after the end of the yarn column reached the area between the

light sources

20, 21 and the pertinent photocells 20', 21, the said relay l3 energizing the electromagnet 14, the core 14 of which is drawn against the action of spring 14" in the direction of arrow 8:, together with the feeding roller 5 mounted thereto, the said roller 5 being thus drawn out of engagement with the feeding roller 6. The feeding of yarn 19 into the magazine 8 is thus being interrupted. The yarn 19 is held in tensioned condition by the continued action of ejector 8'.

After reduction of the yarn supply in the magazine 8 as a result of its withdrawal to a wound bobbin, the action of the

light sources

20, 21 upon the pertinent photocells 20', 21 is renewed, whereupon the relay 13' is switched off and the feeding of power into the electromagnet 14 is interrupted. Consequently, the core 14' together with the feeding roller 5 is released and pressed by the spring 14" into the original position in which the feeding roller 5 is again in engagement with the feeding roller 6, the feeding of yarn 19 into the magazine 8 thus being renewed.

In a modification of the embodiment as shown in FIG. 7, which is shown in FIG. 8 the electromagnet 14 is replaced by a solenoid 15, to which a pressure air supply 15' from a pressure air source (not shown) is connected. The solenoid 15 is connected by the line 15" with a pnuematic cylinder 16, on the piston of which a rod 17 is mounted. Said rod is surrounded by spring 17 and is connected to one of the two feeding rollers,

In the modification according to FIG. 8, the solenoid 15 is switched on upon interruption of the light beam from the

light sources

20, 21 by the photocells 20', 21'. Said solenoid 15 opens the inlet 15' of pressure air, said pressure air being fed through the conduit 15" into the pneumatic cylinder 16, acting therein upon its piston and thus also upon its rod 17. Rod 17 is displaced against the action of spring 17 in the direction of arrow S The feeding roller 5 which is connected with the rod 17, is thus removed from engagement with the feeding roller 6, the feeding of yarn 19 into the magazine 8 thus being interrupted. The yarn 19 is held further in tensioned condition by the uninterrupted activity of ejector 8. Upon reduction of the yarn supply in the magazine 8 due to its withdrawal to the wound bobbin, the action of the

light sources

20, 21 upon the pertinent photocells 20', 21' is renewed and thus the solenoid 15 is switched off, thereupon closing the inlet 15' of pressure air. Simultaneously, the pneumatic cylinder 16 and the line 15" are de-aerated in a known manner, the piston of cylinder 16 being thrust, together with the rod 17, by the action of spring 17' into the initail position, whereby the feeding roller 5 comes again into engagement with the feeding roller 6 and the feeding of yarn 19 into the magazine 8 is renewed.

The advantage of the device according to the present invention consists mainly in its reliable operation, simple construction and minimum response delay of the necessary steps after determining the level of the yarn supply in the magazine.

Although the invention has been illustrated and described with reference to a plurality of preferred embodiments thereof, it is understood that it is in no way limited to the details of such plurality of embodiments but is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

1. Apparatus for automatically controlling the feeding of yarn into a yarn magazine in a textile machine to permit the uninterrupted operation of the machine, comprising a sensor for detecting the degree of filling of the magazine, means for feeding the yarn into the magazine, and means responsive to the sensor for interrupting the feeding of the yarn into the magazine when the magazine contains a predetermined amount of yarn, the sensor being mounted upon the magazine at the outlet thereof, the sensor being constituted by a bottom of the magan'ne, said bottom being mounted on a swingable lever, means yieldably biasing the bottom toward its closed position, and,a magnet mounted for movement by the bottom of the magazine and cooperating with a relay switch in the circuit of which there is connected an element for interrupting the feeding of yarn upon the opening of said bottom.

2. Apparatus according to claim 1, wherein the element for interrupting the feeding of yarn is an electromagnet the core of which is provided on one end with a yard guide selectively moved by the electromagnet.

3. Apparatus according to claim 1, wherein the element for interrupting the feeding of yarn is a solenoid disposed in the relay switch circuit, the solenoid cooperating with a pneumatic cylinder having a piston rod and a yarn guide secured to the free end of the piston rod.

4. Apparatus according to claim 1, wherein the bottom of the magazine is mounted on a swingable two-arm lever, one arm of said lever carrying an adjustable weight, and the other arm of said lever carrying said magnet.

5. Apparatus according to claim 1, wherein the magnet is permanent, and the relay switch is a reed switch disposed to be selectively operated by the magnet as the magnet swings with respect thereto.

6. Apparatus for automatically controlling the feeding of yarn into a yarn magazine in a textile machine to permit the uninterrupted operation of the machine, comprising a sensor for detecting the degree of filling of the magazine, means for feeding the yarn into the magazine, and means responsive to the sensor for interrupting the feeding of the yarn into the magazine when the magazine contains a predetermined amount of yarn, the sensor being mounted upon the magazine at the outlet thereof, the means for feeding yarn into the magazine comprising a means for pulling the yarn from a source of supply and a means for charging the thus fed yarn into the magan'ne, the yarn pulling means comprising opposed driven yarn pressing rollers, the means responsive to the sensor selectively removing the yarn from between the driven yarn pressing rollers by pulling the yarn axially of such rollers.

Claims

1. Apparatus for automatically controlling the feeding of yarn into a yarn magazine in a textile machine to permit the uninterrupted operation of the machine, comprising a sensor for detecting the degree of filling of the magazine, means for feeding the yarn into the magazine, and means responsive to the sensor for interrupting the feeding of the yarn into the magazine when the magazine contains a predetermined amount of yarn, the sensor being mounted upon the magazine at the outlet thereof, the sensor being constituted by a bottom of the magazine, said bottom being mounted on a swingable lever, means yieldably biasing the bottom toward its closed position, and a magnet mounted for movement by the bottom of the magazine and cooperating with a relay switch in the circuit of which there is connected an element for interrupting the feeding of yarn upon the opening of said bottom.

6. Apparatus for automatically controlling the feeding of yarn into a yarn magazine in a textile machine to permit the uninterrupted operation of the machine, comprising a sensor for detecting the degree of filling of the magazine, means for feeding the yarn into the magazine, and means responsive to the sensor for interrupting the feeding of the yarn into the magazine when the magazine contains a predetermined amount of yarn, the sensor being mounted upon the magazine at the outlet thereof, the means for feeding yarn into the magazine comprising a means for pulling the yarn from a source of supply and a means for charging the thus fed yarn into the magazine, the yarn pulling means comprising opposed driven yarn pressing rollers, the means responsive to the sensor selectively removing the yarn from between the driven yarn pressing rollers by pulling the yarn axially of such rollers.