US3141287A

US3141287A - Stop motion for belt-driven rotary spindles

Info

Publication number: US3141287A
Application number: US224474A
Authority: US
Inventors: Bourgeas Pierre
Original assignee: Individual
Current assignee: Individual
Priority date: 1961-12-08
Filing date: 1962-09-18
Publication date: 1964-07-21
Anticipated expiration: 1981-07-21
Also published as: GB960320A; CH398394A; DE1239966B; LU40931A1

Description

July 21, 1964 BQURGEAS 3,141,287

STOP MOTION FOR BELT-DRIVEN ROTARY SPINDLES Filed Sept. 18, 1962 6 Sheets-Sheet l July 21, 1964 P. BOURGEAS 3,141,287

STOP MOTION FOR BELT-DRIVEN ROTARY SPINDLES Filed Sept. 18, 1962 6 Sheets Sh t 2 & 8

/ l [:4 Z 4 I 4 July 21, 1964 P. BOURGEAS STOP MOTION FOR BELT-DRIVEN ROTARY SPINDLES 6 Sheets-Sheet 3 Filed Sept. 18, 1962 P. BOURGEAS STOP MOTION FOR BELT-DRIVEN ROTARY SPINDLES July 21, 1964 6 Sheets-Sheet 4 Filed Sept. 18, 1962 July 21, 1964 P. BOURGEAS STOP MOTION FOR BELT-DRIVEN ROTARY SPINDLES Filed Sept. 18, 1962 6 Sheets-Sheet 6 United States Patent 3,141,287 STOP MOTION FOR BELT-DRIVEN ROTARY SPINDLES Pierre Bourgeas, 110 Ave. Maurice Faure, Valence, Drome, France Filed Sept. 18, 1962, Ser. No. 224,474 Claims priority, application Luxembourg Dec. 8, 1961 12 Claims. (Cl. 5781) The present invention relates to improvements in textile machines of the type comprising belt-driven rotary spindles such as, in particular, the doubling and twisting machines. The invention has for its object to ensure, by means which are characterized by their simple constructional design and reliable operation, the simultaneous stopping of the spindle and of the device which delivers yarn to the spindle in an extremely short period of time, in order to take into account the requirements of highspeed production of the improved machines at present employed, especially with a View to avoiding the winding of non-doubled yarns onto the receiving bobbins of doubling and twisting machines.

The improvements in accordance with the invention are especially characterized by at least one of the following characteristic features:

(a) With each spindle is associated a roller for moving the spindle driving belt or tape away from said spindle, said roller being mounted on a movable support coupled to a member which is adapted to pivot coaxially about said spindle axis and to be caused to pivot from an inoperative position to an operative position under the action of the kinetic energy of rotation of the spindle by means of a friction device which serves at the same time for the purpose of braking the spindle and which is actuated in response to the signal of a yarn stop-motion unit which is suitably disposed on the machine.

(b) The friction device is of the electromagnetic type, one element of the said device and preferably the magnetic field circuit thereof being fixed on the above-mentioned pivotal member, while the other element of the said de vice and preferably a simple annular disc of magnetic metal is adapted to move axially and coupled for rotation to the spindle.

(c) The pivotal member is coupled to the frame of the machine by means of an elastic system providing for movement beyond the dead point and thus effecting the locking of said pivotal member both in the inoperative position and in the operative position thereof.

(d) A manually operated or pedal-operated push-rod provides a means of thrusting back the pivotal member from the operative position to the inoperative position thereof for the purpose of putting the machine back into service subsequently to the tripping action which results from a break in the yarn.

(e) The pivotal member carries two rollers designed to move the driving belt away from the spindle and intended to come into operation selectively depending on whether the machine is rotating either in one direction or in the other, and the elastic system for locking the pivotal member in position beyond the dead point comprises a bearing point and a stop designed to take up selectively one of two positions which are symmetrical with respect to the angular central position of the pivotal member between the two positions of the latter which correspond respectively to one direction of rotation of the spindle and to the other.

(f) The device for delivering yarn also comprises an electromagnetic coupling and braking system which is also placed under the control of the yarn stop-motion unit.

(g) The electromagnetic coupling and braking system of the delivery device comprises a disc of magnetic metal which is coupled solely for rotation to a driven shaft and is capable of being attracted either against a rotary magnetic coupling circuit forming part of a driving shaft or against a stationary magnetic braking circuit.

(12) The machine is provided with a yarn stop-motion unit between the delivery device and the spindle and a yarn stop-motion unit for each separate strand at the input end of the delivery device, the said stop-motion units producing action on an electric change-over switch designed to supply current to the electromagnetic coupling of the delivery device only when no thread is broken and, on the contrary, only to supply current to the electromagnetic brake of the delivery device and to supply current to the spindle brake for the purpose of producing the disengagement of the driving belt as soon as a break in a thread occurs.

(1') A manual control lever serves to maintain the change-over switch in the neutral position in order to release the two brakes without bringing into engagement the coupling unit of the delivery device with a view to permitting the convenient piecing of the threads and the manual rotation of the delivery device and the spindle.

The invention will be more clearly understood from the perusal of the description which follows below and from examination of the accompanying drawings which show by way of example without implied limitation one form of embodiment of the invention:

In these drawings:

FIG. 1 illustrates in profile one side of a doubling and twisting machine which is fitted with a system in accordance with the invention for braking and disengaging the spindle and delivery device.

FIG. 2 is a corresponding view seen from the front.

FIG. 3 shows on a larger scale a detail of the upper portion of FIG. 1.

FIG. 4 is a vertical cross-section taken along the line IV--IV of FIG. 3.

FIGS. 5 and 6 are partial horizontal cross-sections taken respectively along the lines VV and VIVI of FIG. 3.

FIG. 7 shows by means of partial cross-sections, a detail of the lower portion of FIG. 1 relating to the system for disengaging and braking the spindle.

FIG. 8 is a cross-section taken along the line VIII-VIII of FIG. 7.

FIG. 9 is a partial cross-section taken along the line IX-IX of FIG. 8, and

FIG. 10 is an electric circuit diagram of the combined assembly of the disengaging and braking device as illustrated in FIGS. 1 to 9.

In these drawings, there has only been illustrated one section of a doubling and twisting machine, the frame of which is generally designated by the reference 1 (as shown in FIGS. 1 and 2), said frame being symmetrical with respect to the longitudinal vertical central plane whose outline is shown at 2 in FIG. 1.

All the sections of the machine are identical and each comprise a bobbin 4 onto which are wound the doubled yarns and which is fitted on a spindle 5, the said spindle being in turn rotatably mounted on a vertical spindle foot 6 which is fixed inside a hub 7 of the frame 1.

The lower portion of the spindle or so-called boot serves as a pulley for the purpose of driving said spindle in rotation under the action of a tangential belt 8.

A ring-carrier unit 11, on which are mounted the ring proper 12 fitted with its slider 13, anti-balloon rings 14., 15 and a pigtail or balloon-hanger 16, is supported by two lifting and lowering

posts

18 and 19 which slide on two

stationary posts

21, 22, the bottom ends of which bear on the frame land the top ends of which are secured to

brackets

23, 24 respectively. The lifting and lowering movement of the ring-holder is effected by means of any appropriate system of conventional type such as the system which has been illustrated diagrammatically and which comprises a rocker-arm 26 mounted on a longitudinal shaft 27 to which is imparted a reciprocal rocking movement, each of the two ends of the rockerarm 26 terminating in a fork 28 inside which is located a roller 29 mounted on a pin 31 which joins together the lower extremities of the two lifting-and-lowering posts.

The top portion of the frame 1 is provided with a delivery system which is generally designated by the reference 33 and inside which pass the two

yarns

34, 35 to be doubled and twisted. The said yarns first pass individually through two eyes or yarn-

guides

36, 37 of a yarn stop-motion unit which is generally designated by the reference 38, then through a common yarn guide 41, then over a bottom roll 42 which is set at a slightly oblique angle, over a top roll 43, over a feeler 44, and then progress together to a balloon hanger 16 so as to be re-twisted in the ring and slider device referred-to above.

The roller 42 is made integral with a shaft 45 (as shown in FIG. 6) which is rotatably mounted in two ball-

bearings

46, 47, said ball-bearings being mounted in the casing 48 of the delivery device.

Similarly, the roller 43 is fixed on a shaft 51 (as shown in FIG. which rotates in two ball-

bearings

52, 53 also mounted in the casing 48.

The two

rollers

42, 43 are driven in rotation by two gear-

wheels

55, 56 which are respectively integral with the two

shafts

45 and 51 and are engaged with a common gear-wheel 57 (as shown in FIG. 4) which is integral with a shaft 58, this latter being rotatably mounted in two ball-

bearings

61, 62 which are also mounted inside the casing 48.

The shaft 58 is in turn driven in rotation through the intermediary of an electromagnetic coupling and braking device which is generally designated by the reference 63 from a shaft 64 which is integral with a gear-wheel 65, the said gear-wheel 65 being in mesh with another gear-wheel 66 coupled to a driving shaft 67 extending over the entire length of the frame so as to drive the devices which deliver the yarn to the spindles located on the same side of the frame.

The shaft 64 also rotates in two ball-

bearings

68, 69 which are fitted inside the casing 48.

The electromagnetic coupling and braking system 63 comprises a magnetic coupling circuit 71 which contains a winding 72 and a magnetic brake circuit 73 which encloses a winding 74. The stationary magnetic circuit 71 is combined with a drum 76 also of magnetic material which is integral with the driving shaft 64.

A disc 77 of magnetic metal is slidably keyed on a hub 78 which is rigidly fixed to the driven shaft 58 and can be applied either against the drum 76 when the winding 72 is energized or against the stationary magnetic circuit 73 when the winding 74 is energized. In the first case, the disc 77 and consequently the driven shaft in association with the two

rollers

42, 43 is driven in rotation at the same speed as the shaft 64 with which the said driven shaft forms an integral part whereas in the second case, the disc 77 is held motionless against the stationary magnetic braking circuit 73, so that the two rollers are accordingly immobilized.

In the electric circuit diagram of FIG. 10, there are again shown the two

windings

72 and 74 of the coupling and brake respectively. These two windings are supplied from a suitable source 81 of electric current on the one hand directly through a supply-lead 82 and on the other hand through the intermediary of a supply-lead 83, a manually operated starting switch 84, a supply-lead 85, a pallet-type change-over switch 86, the moving contact 87 of which is adapted to be applied selectively either against a stationary contact 88 which is connected to the winding 72 of the coupling unit by means of a lead 89 or against another stationary contact 91 which is connected to the brake winding 74 by means of a lead 92.

The combined assembly is so designed and arranged that the rotary motion of the two

rollers

42 and 43 of the delivery system is thrown out of action and braked as soon as a break occurs either in one of the two constituent yarns at the input end of the delivery system or between said delivery system and the twisting spindle.

To this end, the pallet 86 of the change-over switch is adapted to pivot in the direction of the arrow 1 under the action of any one of three

pivotal levers

93, 94, 95, the first two

levers

93, 94 respectively carrying the two

yarn guides

36 and 37 while the third lever 95 is designed to be thrust back by the feeler 44 under the action of a spring 95a when the said feeler is no longer held back, as in the position illustrated in the figure, by the yarns which are in that case broken.

The device additionally comprises a fourth lever 96 which can be actuated by hand by means of a handle 97 in such manner as to bring the said lever into an intermediate position in which the pallet 86 of the changeover switch is located in the space between the two

stationary contacts

88 and 91 without touching these latter so that neither one or the other of the two

windings

72 and 74 is supplied with current in order to ensure that the coupling unit is accordingly disengaged and that the brake is at the same time released.

The receiving bobbin of the twisting system and the moving system which rotates with the said bobbin are also fitted with a very quick action electromagnetic disengaging and braking device comprising a disc 101 of magnetic metal (as shown in FIG. 7) which is rigidly coupled for rotation to the boot of the spindle 5 and which works conjointly with a magnetic circuit 102 fixed on a plate 112 which is adapted ot pivot through a certain angle on the frame 1 coaxially with the spindle.

The disc 101 is mounted on the ends of threaded studs 103 which are adapted to slide axially inside recesses 104 of the boot of the spindle and which are urged upwards by compression springs 105. This coupling systern is completed by feet 108.

There is fitted in the stationary magnetic circuit 102 a winding 106 which is supplied in parallel with the winding 74 of the electromagnetic brake of the delivery device (as shown in FIG. 10).

When the disc 101 is attracted by the stationary magnetic circuit 102 as the current flows in the winding 106, the said disc 101 is applied against an annular member 107 which has a high coefficient of friction and which is fixed in the top portion of the said magnetic circuit 102.

There has been shown under the reference 111 the axial finger of conventional type for retaining the spindle on the spindle foot. The said finger passes through an orifice 131 of the plate 112.

The spindle-carrier is additionally provided with an automatic disengagement system which is actuated at the same time as the brake under the action of the inertia which is stored in the rotating parts.

To this end, the plate 112 on which is fixed the magnetic braking circuit 102 is also provided with two rollers 113, 114 (as also shown in FIG. 8) which are located at a distance away from the driving belt 8 during the period of normal running of the frame in order that the said belt should be tangentially applied against the boot of the spindle and thus drive this latter in rotation. Each of the said two

rollers

113, 114, for example the roller 114, is mounted to rotate freely on a shaft 109 which is fixed inside a boss 110 of the plate 112 by means of a nut 110a.

The system is designed to produce the disengagement action indifferently in one direction of rotation of the spindle or in the other but it is understood that, when once the system is set, it is intended to operate only in one direction.

The system as represented in the drawings is intended to effect the automatic disengagement of the belt in the direction of rotation of the spindle which is indicated by the arrows f3 in FIG. 8.

In normal operation, the pivotal plate 112 takes up the inoperative position which is shown in full lines in FIG. 8 in which, in particular, the roller 114 is located at a distance away from the belt, whereas in the active position of disengagement as represented in chain-dotted lines at 11211, the roller 114 occupies the position 114a and thrusts back the belt which accordingly does not any longer apply any pressure against the spindle boot and does not drive this latter in rotation. In this constructional arrangement, the axis of the spindle 5 occupies an invariable position in the machine, there being accordingly no need to displace the spindle in order to proceed to disengage its driving belt. It has been found preferable to adopt this arrangement in order to prevent any difiiculties of re-centering of the spindle with respect to the ring when resuming normal operation of the machine.

The plate 112 is held elastically, both in the inoperative position as well as in the operative position thereof by means of a system providing for movement beyond the dead point and comprising a telescopic link-rod, the said system being generally designated by the reference 120. One end of the said link-rod is adapted to pivot about a pin 121 which is adjustably fitted inside a T- section groove 115 which is formed in a block 116, the said block being in turn fixed on the frame 1 by means of screws 117. The other end of the telescopic link-rod pivots about a pin 118 which is integral with the plate 112. A stud 119 which is fixed on the frame 1 serves as a stop for the plate 112 in the inoperative position of this latter under normal running conditions. In its active disengagement position, the plate 112 butts against a pushrod 122 which serves at the same time as a re-arming member, as will be seen later, which is slidably mounted in a block 130 fixed on the frame 1.

The 1ink-rod 120 is constituted by a threaded rod 123, one end of which pivots directly about the pin 121 while the other end 124 which is smooth slides inside a bore 125 of a member 126 which is pivotally mounted on the pin 118.

On the threaded portion of the rod 123 is screwed a cup 127 which is locked in position by means of a lockunit 128. A compression spring 129 is interposed between the member 126 and the bottom of the cup 127 in such manner as to urge the link-rod in the direction of its extension. By screwing the cup 127 on the threaded rod 123 to a greater or lesser extent, the strength of the spring can be regulated at will.

When the plate 112 occupies the inoperative position in which the belt drives the spindle, the pin 118 is located on one side of the straight line which joins the stationary pin 121 and the axis of the spindle whereas in the active disengagement position, the pivot-pin 118 is located on the other side of the said line.

The re-arming bolt 122 which serves to return the pivotal plate 112 from its active disengagement position 112a to its inactive position of normal operation as illustrated in full lines is urged elastically towards its disengaged position by a spring 134. The said bolt 122 can be made to slide towards the pivotal plate 112 by means of a transmission system which comprises a first stirrupshaped lever 135 on which is pivotally mounted at 136 the extremity of the locking rod 122, a horizontal shaft 138 (as shown in FIG. 9) which is journalled in supports 139 secured to the frame 1, a lever 141 which is integral with the shaft 138, a rod 142, the top extremity of which is articulated on the lever 141, and a pedal 143 which is pivotally mounted on a pin 144 fitted in a support 145 which is secured to the frame, there being fitted at an intermediatepoint of said pedal lever a pin 146 about which is articulated the bottom extremity of the rod 142. The said rod 142 is fitted with a lengthadjustment device, for example of the turnbuckle type with two threads of opposite pitch while a spring 149, one end of which is attached at 151 to the

rod

142 and 6 the other end at 152 to the frame 1, pulls the pedal 143 upwards.

When pressure is applied on the pedal 14.3 in opposition to the force of the spring 149, the push-rod 122 is withdrawn through the intermediary of the transmission system mentioned above and causes the plate 112 to swing from its disengaged position to its engaged position in opposition to the elasticity of the link-rod 120 which is designed to pass beyond the dead point.

The force of the spring 134 of the locking bolt can be regulated by means of a nut 154 which is fitted on a threaded portion of the push-rod 122 and provided with a locking nut 155.

In its normal operating position, the telescopic linkrod 120 is set at an angle on one side of the axis of the device. This position corresponds to the direction of rotation f3 of the spindle. If the spindle were to rotate in the opposite direction, the pivot-pin 121 of the telescopic link-rod 120 would be brought to the other end of the groove in which the said pin is fitted, in such manner that the said link-rod is then set at an angle on the opposite side with respect to the axis of the device. The disengaged position of the plate 112 would then be symmetrical with the position 112a which is represented in chain-dotted lines in FIG. 8 with respect to the axis of the system and instead of the roller 114, it would then be the roller 113 which would come into operation so as to thrust back the driving belt 8. The stop 119 would be displaced and brought to 119:! (as shown in FIG. 8). The re-arming of the system would then be effected by means of a locking bolt 122a actuated by a transmission system comprising simply a lever 135a which is fixed, as in the case of the lever 135 which actuates the locking bolt 122, on the horizontal shaft 138 which is operated by means of the pedal.

The operation of the combined assembly of the machine takes place as follows:

In normal operation, the

electromagnetic coupling

72, 76, 77 of the delivery system is in the engaged position, the

electromagnetic brake

73, 74, 77 is disengaged and the electromagnetic brake 101, 106, 107 is also disengaged since the moving contact 87 of the pallet change-over switch 86 (as shown in FIG. 10) is resting on the stationary contact 88 which is connected only to the winding 72 of the electromagnetic coupling of the delivery system.

Irrespective of the location at which a break in the yarn may occur, the pallet of the change-over switch 86 swings over, so that the current supply is interrupted in the electromagnetic clutch winding 72 and, on the contrary, is immediately fed to the brake winding 74 of the delivery device and in the electromagnetic brake winding 106 of the spindle. The two

rollers

42, 43 of the delivery device are therefore no longer driven and are immediately immobilized by the brake.

At the same time, the disc 101 of the spindle is attracted by the electromagnetic system 102 and is immediately braked against this latter, the reaction of which results in the pivotal movement of the plate 112 in the direction of the arrow f3 (as shown in FIG. 8) and consequently the displacement of the belt 8 away from the spindle as a result of the movement of the telescopic link-rod beyond the dead point. As soon as a thread is broken, there accordingly takes place a practically instantaneous disengagement and braking action both of the delivery device and the twisting device at the same time.

In order to piece the yarn; the delivering

rollers

42 and 43 are first released as well as the rotary spindle 5 and, to this end, the pallet-type changeover switch 86 is brought by means of the handle 97 into an intermediate position so as to ensure that none of the electromagnetic devices is supplied with current. Under these conditions, the two brakes are released and the coupling unit of the delivery device is not engaged. As far as the driving belt is concerned, this latter is still held away from contact with the boot of the spindle. When once the broken yarn has been pieced together, the yarns are put back on their normal path, the pedal 143 is depressed in order to engage the spindle and action is produced on the handle 97 in order to engage the delivery device.

It will be understood that the invention is not limited to the forms of embodiment which have been described and illustrated and which have been given solely by way of example, and that a large number of modifications can be made in the said invention without thereby departing either from the scope or the spirit of the invention.

I claim:

1. A textile machine having a frame and comprising belt-driven rotary spindles, and for each spindle: an individual delivery device for supplying yarn to said spindle, a roller for moving the spindle-driving belt away from the spindle, said roller being mounted on a movable support adapted to assume selectively an inoperative position in which said roller permits the belt to be in driving frictional engagement with the spindle and an operative position in which said roller keeps the belt away from the spindle,

the movable support comprising a control member mounted coaxially with said spindle for pivotal movement between an inoperative position and an operative position and operatively connected to said movable support, controllable friction means inserted between said spindle and said control member, and a yarn stop motion unit adapted, in response to yarn breakage, to control said friction means to make them operative for transmitting rotary movement of said spindle to said movable support for turning the latter to brake said spindle and bring said roller into said operative position.

2. A textile machine having a frame and comprising belt-driven rotary spindles, and for each spindle: an individual delivery device for supplying yarn to said spindle, a roller for moving the spindle drive belt away from the spindle, said roller being mounted on a movable support adapted to assume selectively an inoperative position in which said roller permits the belt to be in driven frictional engagement with the spindle and an operative position in which said roller moves the belt away from the spindle, the movable support comprising a control member mounted coaxial with said spindle for pivotal movement between an inoperative position and an operative position and operatively connected to said movable support, controllable friction means inserted between said spindle and said control member, and a yarn stop motion unit adapted, in response to yarn breakage, to control said friction means to make them operative for simultaneously braking said spindle and bringing said roller into said operative position, said friction means being of the electromagnetic type, and having one element comprising a magnetic field circuit fixed on said pivotal control member and another element constituted by an annular disc of magnetic metal adapted to move axially and be coupled for rotation to the spindle.

3. A textile machine having a frame and comprising belt-driven rotary spindles, and for each spindle: an individual delivery device for supplying yarn to said spindle, a roller for moving the spindle drive belt away from the spindle, said roller being mounted on a movable support adapted to assume selectively an inoperative position in which said roller permits the belt to be in driven frictional engagement with the spindle and an operative position in which said roller moves the belt away from the spindle, the movable support comprising a control member mounted coaxial with said spindle for pivotal movement between an inoperative position and an operative position and operatively connected to said movable support, controllable friction means inserted between said spindle and said control member, and a yarn stop motion unit adapted, in response to yarn breakage, to control said friction means to make them operative for simultaneously braking said spindle and bringing said roller into said operative position, said pivotal control member being connected to the frame of the machine my means of an elastic system providing for movement beyond a dead center position and thus effecting the locking of the said pivotal control member both in the inoperative position and in the operative position thereof.

4. A textile machine as defined in claim 1, further comprising a resetting device with an operating lever adapted to thrust back the pivotal member from the operative position to the inoperative position thereof for the purpose of putting the machine back into service subsequently to the tripping action which results from a break in the y 5. A textile machine as defined in claim 3, wherein said pivotal control member carries two rollers designed to move the driving belt away from the spindle and intended to come into operation selectively depending on whether the machine is rotating either in one direction or in the other, while said elastic system for locking in position beyond the dead center position comprises a bearing point and a stop designed to take up selectively one of two positions which are systemmetrical with respect to the angular central position of said pivotal member between the two positions of said pivotal member between the two positions of said pivotal control member which correspond, respectively, to one direction of rotation of the spindle and to the other.

6. A textile machine having a frame and comprising belt driven rotary spindles, and for each spindle; an individual delivery device for supplying yarn to said spindle, a roller for moving the spindle drive belt away from the spindle, said roller being mounted on a movable support adapted to assume selectively an inoperative position in which said roller permits the belt to be in driven frictional engagement with the spindle and an operative position in which said roller moves the belt away from the spindle, to the movable support comprising a control member mounted coaxial with said spindle for pivotal movement between an inoperative position and an operative position and operatively connected to said movable support, controllable friction means inserted between said spindle and said control member, and a yarn stop motion unit adapted, in response to yarn breakage, to control said friction means to make them operative for simultaneously braking the spindle and bringing said roller into said operative position, said individual delivery device comprising an electromagnetic coupling and braking system which is placed under the control of said yarn stopmotion unit and is adapted for connection to a driving shaft of the delivery device.

7. A textile machine as defined in claim 6, wherein said electromagnetic coupling and braking system of the delivery device comprises a disc of magnetic metal which is coupled solely for rotation to said driving shaft and is capable of being attracted either against a rotory magnetic coupling armature forming part of said driving shaft or against a stationary magnetic braking armature.

8. A textile machine as defined in claim 6, characterized in that said machine is provided with a yarn stopmotion unit between said delivery device and said spindle and a yarn stop-motion unit for each separate strand on the input side of said delivery device, and an electric change-over switch acted upon by said stop-motion units and designed to supply current to said electromagnetic coupling unit of said delivery device only when no thread is broken and, on the contrary, to supply current to said electromagnetic brake of said delivery device and to supply current to said spindle brake for the purpose of producing the disengagement of the driving belt as soon as a break in the yarn occurs.

9. A textile machine as defined in claim 8, further comprising a manual control lever adapted to serve to maintain said change-over switch in neutral position in order to release the two brakes without bringing into engagement said coupling system of said delivery device with a view to permitting the convenient piecing of the threads and the manual rotation of the said delivery device and said spindle.

10. In a textile machine, in combination, rotary spindle means; belt means engaging said rotary spindle means for driving the latter; displacing means located adjacent said spindle and movable between a position spaced from said belt means and a position engaging said belt means and holding the latter at a location displaced from said spindle means to stop the driving thereof; and means respondin automatically to yarn breakage and cooperating with said spindle means and displacing means for transmitting movement of said spindle means to said displacing means to move the latter from said position spaced from said belt means to said position engaging said belt means, whereby the energy of the rotating spindle means itself is used to shift the belt means away from the spindle means upon yarn breakage and whereby the dissipation of the energy of the rotating spindle means in moving said displacing means acts to brake said spindle means.

11. In a textile machine as recited in claim 10, releasable holding means cooperating with said displacing means for releasably holding the latter in said position engaging said belt means and maintaining the latter displaced from said spindle means; and manually operable means co-acting with said releasable holding means for actuating the latter to release said displacing means for return to said position spaced from said belt means so that said belt means can return to its position engaging and driving said spindle means.

12. In a textile machine, in combination, support means; spindle means supported for rotary movement by said support means; belt means engaging said spindle means for driving the latter; belt-displacing means coaxial with said spindle means and also supported for rotary movement by said support means, said belt-displacing means being turnable from a position spaced from said belt means to a position engaging said belt means and displacing the latter away from said spindle means to stop driving the latter, said belt-displacing means and said spindle means respectively having a pair of annular coaxial portions located adjacent each other; electromagnetic means carried by one of said annular portions; and armature means carried by the other of said annular portions for movement by said electromagnetic means to a position placing said spindle means and belt-displacing means in driving engagement with each other so that the rotary movement of said spindle means will then be transmitted to said belt-displacing means to turn the latter to said position engaging said belt means and displacing the latter from said spindle means; and switch means connected electrically to said electromagnetic means: and responding automatically to yarn breakage for energizing the electromagnetic means to place said spindle means and belt-displacing means in driving engagement with each other, the driving of said belt-displacing means to said position displacing said belt means from said spindle means acting also to brake the rotation of said spindle means.

References Cited in the file of this patent UNITED STATES PATENTS 731,272 Bradley June 16, 1905 784,364 Tyman Mar. 7, 1905 2,375,605 Winslow May 8, 1945 3,036,421 Schroder May 29, 1962

Claims

1. A TEXTILE MACHINE HAVING A FRAME AND COMPRISING BELT-DRIVEN ROTARY SPINDLES, AND FOR EACH SPINDLE: AN INDIVIDUAL DELIVERY DEVICE FOR SUPPLYING YARN TO SAID SPINDLE, A ROLLER FOR MOVING THE SPINDLE-DRIVING BELT AWAY FROM THE SPINDLE, SAID ROLLER BEING MOUNTED ON A MOVABLE SUPPORT ADAPTED TO ASSUME SELECTIVELY AN INOPERATIVE POSITION IN WHICH SAID ROLLER PERMITS THE BELT TO BE IN DRIVING FRICTIONAL ENGAGEMENT WITH THE SPINDLE AND AN OPERATIVE POSITION IN WHICH SAID ROLLER KEEPS THE BELT AWAY FROM THE SPINDLE, THE MOVABLE SUPPORT COMPRISING A CONTROL MEMBER MOUNTED COAXIALLY WITH SAID SPINDLE FOR PIVOTAL MOVEMENT BETWEEN AN INOPERATIVE POSITION AND AN OPERATIVE POSITION AND OPERATIVELY CONNECTED TO SAID MOVABLE SUPPORT, CONTROLLABLE FRICTION MEANS INSERTED BETWEEN SAID SPINDLE AND SAID CONTROL MEMBER, AND A YARN STOP MOTION UNIT ADAPTED, IN RESPONSE TO YARN BREAKAGE, TO CONTROL SAID FRICTION MEANS TO MAKE THEM OPERATIVE FOR TRANSMITTING ROTARY MOVEMENT OF SAID SPINDLE TO SAID MOVABLE SUPPORT FOR TURNING THE LATTER TO BRAKE SAID SPINDLE AND BRING SAID ROLLER INTO SAID OPERATIVE POSITION.