US3103779A - Tube for ring spinning frame and apparatus for connecting a yarn end to said tube - Google Patents

Description

cs. c. VAN DEN BERG ETAL 3,103,779 TUBE FOR RING SPINNING FRAME AND APPARATUS FOR CONNECTING- A YARN END TO SAID TUBE Filed June 27, 1962 Sept. 17, 1963 6 FIG.1

JNVENTORJ G C. van aZew Berg United States Patent TUBE FOR RING SPINNING FRAME AND APPA- RATUS FDR CONNECTING A YARN END T0 SAID TUBE Giisbertus C. van den Berg, Groenlo, and Hendrik Glastra, Enschede, Netherlands; said van den Berg assignor to said Glastra Filed June 27, 1962, Ser. No. 205,635 Claims priority, application Netherlands July 13, 1961 3 Claims. ((11. 57106) The invention relates to tubes for ring spinning frames, the term spinning frame being meant also to comprise other frames for the production of yarn, such as doubling and twining frames, which comprise a rotating spindle onto which yarn is wound while being twisted.

A known problem connected with ring spinning frames is that of restarting the spinning process after dofling, that is to say after a full tube on a spindle has been replaced by an empty one, for the yarn end coming from the drawing rollers must be connected to the tube on the spindle in such a way that it does not get loose again when the spindle starts rotating.

it is common practice to meet the problem by laying a couple of windings of the yearn on the spindle beneath the tube before the full tube is removed from the spindle. These windings are pulled upwards on the spindle when the tube is being removed, and are clamped between the spindle and the empty tube when the latter is pushed onto the first.

The drawbacks of this system are obvious. Pieces of yarn remaining on the spindles make it diliicult to push the tubes on and pull them off the spindles, and may even prevent them from being brought down to their correct positions.

It is an object of the invention to provide a tube for ring spinning frames that offers the possibility of restarting the spinning process without any yarn being wound on the spindle.

For this purpose, a tube according to the invention is provided with a brush-like top end, consisting of a number of thin, flexible pins which are axially directed and placed closely together, so that a thread or yarn, laid on them and pushed or pulled between them, will be held sufiiciently fast for starting the spinning process. On the other hand the yarn end will easily come loose when the yarn on the tube is wound off by a winding machine.

The invention further relates to a device for connecting a yarn end to the above-described tube on a ring spinning frame equipped with an automatic or semi-automatic doiiing apparatus, for instance the combined spinning and winding machine described in our co-pending application, Serial No. 205,636, filed June 27, 1962.

This device comprises a thread cutter of the type that can cut the yarn between the traveler and the doffed tube and can hold one yarn end, a hingingly mounted arm bent in a V, means for operating said cutter and means for moving said arm downwards when the device is moved towards the spinning spindle.

The invention will be further illustrated with the help of the accompanying drawing. In this drawing:

FIG. 1 shows a tube according to the invention;

FIG. 2 shows a perspective view of a device for conmeeting a yarn end to the tube of FIG. 1;

FIG. 3 shows a detail of the device of FIG. 2.

The tube 2, which is placed on a partly shown spindle 1, is provided at its top end with a metal reinforcement 3, on which a plate-shaped element is fixed by means of a cylindrical connecting piece 4 having a smaller diameter. The recess thus formed between the reinforcement 3 and the element 5 can co-operate with a forked gripper of a dotting apparatus not shown and not forming part of the invention.

The element 5 is provided with a number of pins 6 which are preferably made of elastic material, for example synthetic high polymers, and form a kind of brush.

Before the spinning process is started with an empty tube on the spindle, the yarn end is laid between the pins 6. The pins 6 are so close together that they exercise sufiicient friction on the yarn end to hold it when the spindle star-ts rotating. As soon as there are a few windings of yarn on the spindle, the yarn end is fixed so tightly that the yarn breaks when an attempt is made to pull it loose.

Laying the yarn end between the pins 6 can be done by hand and means a considerable saving of time with re spect to the usual method of winding the yarn a couple of times around the spindle before the tube is put on. This operation is so simple that it can easily be performed automatically or semi-automatically by means of a device that is of a cheap and uncomplicated construction.

This device is shown in FIGURES 2 and 3. It is built in a case 7, which is provided at its upper side with a yarn guiding groove 8. The bottom side is formed by a gripper 9 which is slidable transversely to the direction of the yarn 10. The yarn 10 is situated between the traveller below and the full tube that is taken upwards oif the spindle.

In the case 7 is mounted a cutter which consists of a knife 11 and a block 12 of elastic material, wherein a recess 13 is provided. The cutter further comprises a clamping element 14, co-operating with a rib 15 on the upper side of the block 12, and a clamping element 16, co-operating with the fiat underside 17 of the block 12. The block 12 is fixed to an operating rod 18, which can operate a number of cutters simultaneously.

When the block 12 is moved towards the knife 11, the thread 3 is at first clamped between the clamping element 16 and the flat underside 17 of the block 12, as also between the rib 15 and the clamping element 14. After this the knife 11 cuts the thread; when block 12 moves still further the rib 15 gets clear of the clamping element 14; then the thread end which leads to the doffed tube, is loosed. The other end, however, is still being held between the element 16 and the underside 17 of the block 12. Now when an empty tube 2 has been placed on the spindle, the device is moved towards it and encompasses it with the recess formed in the gripper 9. Hereby the gripper 9 is pushed back against the action of a spring 19, whereby at a determined moment the upstanding pin 21} pushed against the finger 21 0f the arm 23 which is hingingly mounted on the axis 22 and is bent into a V, into the bottom part of which the yarn 10 is pulled by the top of the tube 2. By the action of the pin 20 the arm 23 is moved towards the top of the tube; at the same time the block 12 is moved back so that the clamped yarn end comes loose and is laid between the pins 6 by the movement of the arm 23, which pins 6 then hold the yarn end. Then the device is moved back, the arm 23 is moved upwards by the action of a spring 24 and the spinning process can be started.

For each spindle of the spinning frame a device as described above is present. 'It is, therefore, of advantage that the device according to the invention comprises only a few parts which, in addition to this, need not comply with narrow tolerances. Therefore, the device here described is rather cheap to construct, which is a great advantage considering the number required.

We claim:

1. A tube for a ring spinning frame, having a substantially flat top end, a number of axially directed flexible pins provided on the top end, said pins being sufliciently close together for a yarn end laid between them to be held during the beginning of the spinning process.

2. An apparatus for connecting a yarn end to the top of a tube according to claim 1, comprising a cutter of the type that can hold one of the yarn ends after the yarn 5 has been cut, means for operating said cutter, a hinging arm having a V-shaped end, and means for swinging said arm down on the top of the tube when the apparatus is moved towards the tube.

3. An apparatus according to claim 2, at the bottom 10 4 side of which a sliding element is provided, said sliding element being meant to cooperate with the top end of the tube when the apparatus is moved towards the tube, the movement of the hinging arm being derived from the movement of said sliding element.

References Cited in the file of this patent UNITED STATES PATENTS 1,683,436 Barbour Sept. 4, 1928

Claims (2)

1. A TUBE FOR A RING SPINNING FRAME, HAVING A SUBSTANTIALLY FLAT TOP END, A NUMBER OF AXIALLY DIRECTED FLEXIBLE PINS PROVIDED ON THE TOP END, SAID PINS BEING SUFFICIENTLY CLOSE TOGETHER FOR A YARN END LAID BETWEEN THEM TO BE HELD DURING THE BEGINNING OF THE SPINNING PROCESS.

2. AN APPARATUS FOR CONNECTING A YARN END TO THE TOP OF A TUBE ACCORDING TO CLAIM 1, COMPRISING A CUTTER OF THE TYPE THAT CAN HOLD ONE OF THE YARN ENDS AFTER THE YARN HAS BEEN CUT, MEANS FOR OPERATING SAID CUTTER, A HINGING ARM HAVING A V-SHAPED END, AND MEANS FOR SWINGING SAID ARM DOWN ON THE TOP OF THE TUBE WHEN THE APPARATUS IS MOVED TOWARDS THE TUBE.

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