GB2072716A - Doffing cops from the spindles of ring spinning frames and ring twisters - Google Patents

Abstract

The doffing of a cop (5) from the spindle (3) of a ring spinning frame or ring twister is facilitated by the provision of movable yarn diverting members including the yarn guide (50) which normally lies directly above the spindle cap (22) and a swingable finger (44) which co-operates with an underwinding flange (9) to sever yarn extending between the cop and windings on the under winding flange. <IMAGE>

Description

SPECIFICATION Doffing cops from the spindles of ring spinning frames and ring twisters The invention relates to an automatic doffing of cops from the spindle and removal thereof in the case of ring spinning frames or ring twisters, in which a rail equipped with gripping devices allotted to a group of spindles is brought from a resting position into a position for gripping the cops which are on the spindles and the cops are doffed from the spindles by sudden raising of the rail and are set down on a cop-conveying device.

In the case of the known apparatus for doffing the cops at ring spinning frames or ring twisters, the operation is carried out in one instance with gripping devices which are turned upside down by reversal over the cops and are pushed on to the latter, the annular gripping device having a flexible insert projecting on both sides of the ring. In another instance use is made of gripping devices which consist of clamp jaws which hold the cop fast between them. In the doffing procedures the yarn from the drawing system to the traveller for the doffing motion is frequently broken.

The object of the invention is to arrange the doffing of the cop in such a way that the yarn approaching from the yarn guide gets free of the spindle cap before the cop is seized and is moved into a zone in which it can no longer be seized by the gripping device.

According to one aspect of the invention there is provided a method of doffing cops from the spindles of ring spinning frames or ring twisters, in which a rail equipped with gripping devices allotted to a group of spindles is brought from a resting position into a position for gripping the cops which are on the spindles and the cops are doffed from the spindles by sudden raising of the rail and are set down on a cop-conveying device, after the winding operation is finished the spindles carrying the cops are turned forward through at least one revolution to displace the yarn away from the cops, and the yarn is kept swung out of the way of the cop in the neighbourhood of the spinning ring and at the yarn guide, and through a further turning of the spindles forward the yarn is automatically severed, whereupon the cops are doffed from the spindles and carried away and the spindles thereafter are turned back.

Through such a procedure it is prevented reliably and with certainty that the yarn coming from the yarn guide can be seized and broken on the cop being seized. The yarn in question is kept at an adequate distance while the doffing of the cop from the spindle is carried out. This makes a continuous operation possible, in the case of automatically proceeding working cycles, without there being any risk of interruptions being brought about owing to the doffing procedure due to unintentional breakage of the yarn passing from the drafting assembly to the traveller and from there to the drafting tumbler.

Interruptions of operation and the consequences connected therewith are eliminated.

According to another aspect of the invention there is provided apparatus for doffing cops from the spindles of ring spinning frames and ring twisters which include an upper yarn guide, a rotatable spindle, a vertically-movable ring rail with ring holders and spinning rings with ring travellers, a doffing tumbler and bobbins mountable on the spindle, comprising diverting members for the yarn being supplied to the bobbin or the cop, said diverting members being in the neighbourhood of the ring rail at the yarn guide and in the reach between the yarn guide and ths ring rail and a driving mechanism for slow rotation both forward and backward of the spindles. Through such an arrangement, the entire operation can be easily automated, in the course of which it can be controlled by suitable switches and the like.The diverting members guarantee that the yarn is reliably kept at a distance from the cop during the procedure of doffing same from the spindle. Fingers may be arranged on the ring rail as diverting members projecting into the zone of the yarn. In doing so the fingers may be swivelled back and forth by a spindle supported on the ring rail. The fingers are preferably shaped slightly bent at the end, the bending being preferably bilateral in form in order that independence from the sense of turning of the spindle is afforded.

The yarn guide serving for the feeding of the yarn is arranged to be swingable out from a normal position, preferably by means of a rotary mounting rod, whereby the yarn can be brought up to a relatively large distance from the cop. Moreover, there may be arranged, between the yarn guide at the upper end of the cop and the diverting device having effect in the reach of the yarn at the lower end of the cop, a further diverting device which serves for the lateral deviation of the yarn. Such a further diverting device may have pins which are arranged on a movable bar. What is achieved in this way is that the yarn is brought into and kept at an ample distance from the cop being doffed, through appropriate looping of the two earlier diverting members.

An embodiment of the invention will now be described by way of example, with reference to the accompanying drawings, in which: Fig. 1 illustrates in elevation and diagrammatically an exemplary embodiment of the apparatus for doffing and removal of cops at a ring spinning frame or ring twister; Fig. 2 shows in side elevation and diagrammatically a spindle producing the cop and a device for keeping the yarn in a position in which the yarn is detained by diverting members to the rear of the cop; Fig. 3 represents schematically a plan view of the parts shown in Fig. 2, two spindles being shown side-by-side; Fig. 4 shows in side elevation the spindle with cop and the devices for keeping the yarn in a position in which the yarn has been moved to the rear and in the middle reach to the side;; Fig. 5 is a diagrammatic cutaway front view of the position represented in Fig. 4 of the diverting mem bers, in conformity with the arrow V; Figs. 6 and 7 illustrate diagrammatically two different positions of many possible positions of the ring traveller; Fig. 8 shows diagrammatically and in plan view the main drive forthe spindles as well as the drive fortheforward and reverse turning; and Figs. 9 and 10 represent diagrammatically in a cutaway portion different positions of the cop in relation to the course of the yarns, Fig. 9 illustrating the operational phase of Fig. 6 and Fig. 10 that of Figs. 4 and 5.

The ring spinning frame and ring twister 1 has a machine frame 2 on which are rotated spindles 3 for the mounting of bobbins 4 for the production of yarn cops 5. Slivers 6 are fed by way of guide discs 7 from cans (not shown) to a drafting assembly 8 where they are formed into rovings. The rovings are spun into yarns which are wound on the bobbins 4 disposed on the spindles to form the cops 5. Drafting tumblers 9 are provided at the lower part of the spindles and, when cops are fully wound, these take up the yarn owing to the lowering of a ring rail into the doffing position.

A jack 10 is provided for the lifting of the full cops from the spindles 4. The jack 10 includes a lifting slide 11 which is conveyed along a lifter motion column 13 by rollers 12. To-and-fro movement is imparted by a cop-lifter motor 14 to a screw spindle 15, which movement is conveyed through belts 16 (with steel wire inserts) at both ends by way of guide pulleys 17 to the lifting slide 11. There is secured to the lifting slide 11 along the machine a bar 18 which carries forks 19 which engage in an annular groove 20 in the drafting tumblers 9. The drafting tumblers 9 can be lifted with the help of the forks 19, whereby the bobbin located thereabove with the cop 5 is pushed upwards until the bobbin top 21 juts out somewhat above the spindle cap 22.

The conveying device 23 for removing the complete cops is arranged above the machine, the conveying device 23 in the form of a conveyor belt possibly having placed beneath same a shaped sheet 24 of metal for guidance and support of the cops. A gripping device 25 serves for transfer of the complete cops from the lower forming position to the upper position for letting the cops down on to the conveying device 23. This gripping device includes a gripper gib 26 which is supported by rollers for movement along guide elements 28. The gripper gib 26 is provided with clamp members which are in the form of clevis members 29 and 30 and are supported for swivelling movement about a shaft 31. The clevis members 29 and 30 overlap one another to some extent in the closed position and can occupy two different open positions.

The guide elements 28 extend from the lower reach of the machine at the level of the spindles 3 up to above the machine, i.e. above the conveying device 23. Rods, tubes or section rails may serve as guide elements which extend in a curve at least in the upper reaches thereof. Drawstrings 32, which are guided over rollers 33, may be provided for impulsion for movement of the gripper gib 26. One end of each drawstring acts upon the gripper gib 26, whereas the other end leads to a winch 34 which can be actuated in one or the other direction from a motor 35 and a transmission belt 36.

Three devices 41,42 and 43 are provided for keep ing at an adequate distance from the cop 5, the course of the yarn 40proceeding from the drawing system 8 to the doffing tumbler 9. The device 41 serves to divert the yarn 40 in the neighbourhood of the doffing tumbler 9 and preferably comprises a finger 44. The latter can be mounted on a shaft 46 pivoted on the ring rail 45, so that the finger 44 can be swung into reach of the yarn 40. The ring rail 45 is provided with ring holders 47 and spinning rings 48 with a ring traveller 49. The second diverting device 42 pertains to the yarn guide 50 which is attached to an arm 51 which is firmly united with the rotatable shaft 52. The third diverting device 43 for the yarn 40 includes a bar 53 which is provided with pins 54 through the displacement of which the yarn 40 is diverted laterally.

When winding of the copis is completed, the ring rail 45 is lowered into the doffing position, i.e. into the plane of the doffing tumbler 9. The yarns are wound on in the zone 37 of the doffing tumbler 9 and the machine comes to rest. After the doffing procedure has been completed, the ring rail 45 with the ring holders 47 and the spinning rings 48 is at its lowermost position (Fig. 2). In this procedure the yarn 40 coming from the yarn guide 50 has been would by the ring traveller 49 on to the upper part 37 of the doffing tumbler.Figs. 6 and 7 show two differend ones of many possible positions of the ring traveller 49 and of the yarn 40' leading from the ring travellertothe doffingtumbler9 afterthe stoppage of the spindle the fingers 44 having already been swung forwardly. The representation conforms to a rotation of the spindles in the clockwise sense (Ztwist). The rotation may, however, also take place in the counter-clockwise sense (S-twist). The fingers 44 preferably have an offset end position 44a, which is designed appropriately for both senses of rotation (arrow F). In Fig. 7 both ring traveller and yarn positins are marked in after picking up by the finger 44.

Through actuation of a switch, the fingers 44 can be swung forwardly (arrow A) into the reach of the spinning rings 48 by means of a shaft 46 turned by a geared motor (not shown). The spindles 3 together with the doffing tumblers 9 displaceably mounted on the spindles and the cops 5, are then turned slowly through a driving arrangement 56.

Fig. 8 conveys a summary with regard to the main drive 57 for the spindles 3 and the drive 56 for turning the spindles forwards and backwards. The spindles 3 are rotated, during spinning, through the main motor 58, by way of V-belt pulley 59, V-belts 60, V-belt pulley 61, spindle drive shaft 62, which is supported in the bearings 71, spindle drive pulley 63, guide pulley 64 and spindle drive belt 65. After the spindles have gradually stopped through switching off of the main motor 58, the clutch 66 is engaged whereby the geared motor 67 is connected with the spindle drive shaft 62 by way of the toothed belt pulley 68, toothed belt 69 and toothed belt pulley 70, so that the spindles can be turned slowly forwards or backwards.

The spindles are turned forwards from the Fig. 9 position (arrow B, Fig. 3) by means of the drive arrangement 56 through at least one revolution, preferably about 1; revolutions, the yarn 40 being held fast and stretched by the finger 44 behind spindle 3.

During the forwards turning, the yarn guides 50 are swung upwardly (arrow C, Fig. 2) out of the normal position, whereby the yarn is withdrawn from the spindle cap 22 in co-operation with the forwards turning.

After this first forwards turning has finished, the ring rail 45 and simultaneously therewith the doffing tumbler 9 is raised to such an extent on the spindle 3 that the doffing tumbler can turn relative to the spindle 3, the bobbin 4 with the cop 5, however, being connected essentially rotationally fast with the spindle 3 through a bobbin holder (not shown).

After the raising of the ring rail 45 and the doffing tumbler 9 (Fig. 10) a second forwards turning of the spindles 3 takes place, the cops 5 being taken along by the spindles 3, while the doffing tumbler is held fast by the yarns wound thereon. Through second forward turning, the doffing yarns 40', i.e. the yarns, which run from the cops to the doffing tumbler, are pulled over the knife mounted in the upper rim of the doffing tumbler 9 and are detached.

After the second forward turning has ended, the ring rail 45 and the doffing tumblers 9 with the bobbins 4 and the cops 5 are raised to such an extent that the cops 5 can be comfortably grasped by the gripping arrangement 25. At the same time the bar 53 is pushed to the right in the direction of the arrow D (Fig. 5), the yarns being deflected in the same arrow direction D and stretched by the pins 54. In that way it is ensured that the fingers 44, swung to the rear after a time lag together with the yarns 40 (arrow E, Fig. 4), reliably pick up the yarns 40.

The doffing yarns 40' leading from the cops 5 to the doffing tumblers 9 are now detached and the cops are freed from the yarns 40, so that the doffing procedure can be set in motion. For that purpose, the gripping appliance travels downwards. The gripping members 29,30 grasp the cops the gripping appliance travels upwards and lets the cops down on the conveyor belt 23. The fingers 44 are again swung forwards. The doffing tumblers 9 are depressed into the normal position again and the bar is drawn back into the normal position. The ring rail then moves upwards, while the fingers 44 are swung back with release of the yarns 40 and the spindles 3 are again turned backwards to reduce the yarn tension. After fresh bobbins 4 have been placed on the spindles 3, the yarn guides 50 are lowered again into the normal position and the spindles 3 are turned backwards, in order to reduce the yarn tension. Spinning may be started again with the machine, there being no need to piece up the yarn 40 again as the ends of the yarns are wound on to the doffing tumblers in the zone 37.

The entire procedure may be automated, by doing which it is controlled by suitable switches and can thus be interrupted when required. The bringing of the yarn into a predetermined spacing from the cop may also be utilized without the doffing procedure, merely in order to facilitate the removal of the cops, e.g. with different appliances.

Claims (10)

1. A method of doffing cops from the spindles of ring spinning frames or ring twisters, in which a rail equipped with gripping devices allotted to a group of spindles is brought from a resting position into a position for gripping the cops which are on the spindles and the cops are doffed from the spindles by sudden raising of the rail and are set down on a cop-conveying device, after the winding operation is finished the spindles carrying the cops are turned forward through at least one revolution to displace the yarn away from the cops, and the yarn is kept swung out of the way of the cop in the neighbourhood of the spinning ring and at the yarn guide, and through a further turning of the spindles forward the yarn is automatically severed, whereupon the cops are doffed from the spindles and carried away and the spindles thereafter are turned back.

2. Apparatus for doffing cops from the spindles of ring spinning frames and ring twisters which include an upper yarn guide, a rotatable spindle, a vertically-movable ring rail with ring holders and spinning rings with ring travellers, a doffing tumbler, and bobbins mountable on the spindle, comprising diverting members for the yarn being supplied to the bobbin or the cop, said diverting members being in the neighbourhood of the ring rail attheyarn guide and in the reach between the yarn guide and the ring rail, and a driving mechanism for slow rotation both forward and backward of the spindles.

3. Apparatus according to claim 2, wherein fingers are arranged on the ring rail as diverting members movable into the reach of the yarn, and the fingers can be swivelled back and forth by a shaft supported on the ring rail.

4. Apparatus according to claim 2 or 3, wherein the fingers have end portions shaped slightly bent.

5. Apparatus according to any one of claims 2 to 4; wherein the fingers have end portions bent bilaterally.

6. Apparatus according to any one of claims 2 to 5, wherein the yarn guide serving for the feeding of the yarn is arranged to be swingable out from a normal position by means of a rotatable mounting rod.

7. Apparatus according to any one of claims 2 to 6, wherein the third diverting device is arranged between the yarn guide and the first diverting device, and in that the third diverting device has pins for lateral diverting of the yarn and which are arranged on a movable bar.

8. Apparatus according to any one of claims 2 to 7, comprising a jack for lifting cops by means of forks gripping into doffing tumblers and a guidance device for the gripping appliances taking the cops along, the guidance device extending at least at the upper reach thereof in a curve above the machine and along which the gripping appliances are movable.

9. A method of doffing cops from the spindles of ring spinning frames or ring twisters, substantially as hereinbefore described with reference to the accompanying drawings.

10. Apparatus for doffing cops from the spindles of ring spinning frames or ring twisters, substantially as herein before described with reference to the accompanying drawings.