GB2048975A - Cable twisting machine with bobbin changing device - Google Patents

Abstract

A cable twisting machine has a member 4 for supporting a bobbin 5. A door enables the bobbin to be rolled in and out of the machine. A bobbin changing device has a lifting frame 7 running on rails fixed to the stands 2, 3 with a minimum of three guide rollers for each stand. The frame 7 has a bobbin-carrying turn-table 8 with a fixed bobbin-abutting stop. A sleeve 9 mounted on turn-table 8, is engaged with and rotated by a turn pin 6 when the frame is lowered. A pneumatic, electromechanical or hydraulic drive moves the frame via a stranded wire. <IMAGE>

Description

SPECIFICATION Cable industrial buckling machine with semiautomatic bobbin changing device The invention relates to a cable industrial buckling machine provided with a bobbin changing device which, besides rolling an empty bobbin into the machine and fixing it in a yoke, automatically carries out each phase of the liftingin and rolling out without affecting the floor space requirement of the buckling machine.

It is well known that one of the special fields of cable production, characterized by high productivity, is the production of twist using buckling machines. In these machines the twist, finished product, is stored on the bobbin arranged on a so-called yoke mounted in bearings at both ends between the rotary parts of the machine. As these machines are suitable for the production of twist consisting mainly of bare copper wire, the production bobbin fully loaded with the skein can be very heavy. Usually the bobbin is manually lifted out of the machine, or lifted out using a bobbin removing device.

It is generally known that the traditional bobbin removing device consists of a crane with a rotary bracket, by which the full bobbin is lifted out of the yoke through the upper part of the buckling machine, where, owing to the built-in structural parts i.e. pulling and winding devices, movement is restricted. Thus, damage may easily occur to both the buckling machine and skein on the bobbin. At the same time the bobbin replacement is time-consuming, because prior to removal, the bobbin has to be fixed to a lifting rope of the hoist, and has to be released after its lifting out.

Furthermore, there is a constant risk of accident.

The bobbin removing device increases the floor space requirement of the production line.

A single twist buckling machine is known, the construction of which enables a simpler winding.

The construction is described in British patent specification No. 1,138,783, which however, can only be used in single twist buckling machines.

There is an increased risk of accident.

Furthermore according to Hungarian patent application No. Dl-300 titled "Cable industrial buckling machine with bobbin changing device", the bobbin changing device is arranged under the yoke on the supporting frame of the supporting block. In this solution, the bobbin change is simple, but even this is not suitable for replacing the bobbin of any optional weight, because according to strength calculations, such large geometrical dimensions are needed on the arms and joints of "Nurnberg scissors" in case of a 400 mm rim diameter bobbin, that it can not be built in the space available in the buckling machine.

It is generally known, that a bobbin removing and changing device can be used in buckling machines having only a 400 mm rim diameter bobbin.

In view of the foregoing it follows, that the bobbin changing device according to Hungarian patent application No. Dl-300 cannot be built into larger machines for structural reasons. On the other hand, building it into smaller machines is unnecessary. since the lifting of weights in these machines according to the ABEO specifications is permissible. Furthermore, this bobbin changing device is only capable of lifting and of lowering the production bobbin into the yoke. The 90C turn necessary for rolling out of the machine has to be carried out manually, which increases the servicing time and the risk of accident.

The invention is aimed at a buckling machine, which is provided with a semi-automatic bobbin changing device. This enables the bobbin to be changed at the buckling machine from underneath with a full bobbin of optional weight, within the shortest possible time, without the risk of accident and without increasing the floor space requirement of the buckling machine.

The invention is based on the recognition, that the bobbin can be changed in the buckling machine, even in the case of optional bobbin weight, without the use of an external bobbin lifting device. If, instead of a jointed lifted device, the bobbin changing device, constructed with suitable structural elements, is arranged in the space between the structural units of the -supporting block, stands and the yoke, the geometrical dimensions of which will only negligibly increase with the load.

According to the invention, a cable industrial buckling machine having a closed supporting block, a yoke bearing supported at both ends to support the pulling and winding units, as well as a semi-automatic bobbin changing device, comprises a door provided on the lower part of stands facing the servicing side, which ensures that the bobbin can be rolled in and out, the door being actuated by a control device which is connected to a main control unit of the machine, furthermore the bobbin changing device has a lifting frame below the bobbin arranged in the yoke connected to rails fixed to the internal end surface of the stands with a minimum of three guide rollers for each stand and with a rope, the lifting frame having a turnplate built up from a stationary and moving part with a fixed stop arranged on the upper moving part of the turnplate, opposite to which spring pins are in symmetrical arrangement, compressible only under the weight of the full bobbin, parallel guides arranged perpendicularly to the spring pins, a grooved turnsleeve on the lower stationary part of the turnplate, and a turn pin below the lifting frame fixed on the supporting block, and a drive actuating the lifting frame, as well as a rolling track arranged on the supporting block between the door and turnplate.

Advantages of the buckling machine according to the invention are manifest mainly in the fact, that change of the full bobbin in a buckling machine of any size takes place automatically except for rolling in the bobbin and fixing it in the yoke. The bobbin changing device does not increase the floor space requirement of the buckling machine. Thus, with a relatively low expenditure, the servicing time of the machine is considerably reduced, and at the same time the operator is relieved of hard physical labour.

The invention will now be described by way of example, with reference to the accompanying drawings in which: Figure 1 is a front view of a bobbin changing device built into a buckling machine according to the present invention; Figure 2 is a plan view of the bobbin changing device built into the buckling machine; Figure 3 is a section of the bobbin changing device taken along the line A-A of Figure 2, and Figure 4 is a plan view of a turnplate of the bobbin changing device.

Figure 1 shows stands 2 and 3, which are fixed to a supporting block 1 of a buckling machine. A bobbin 5 is arranged in a yoke bearing 4, which is supported in the stands 2 and 3. A turn pin 6 is mounted in the supporting block 1 below the yoke 4.

A turnplate 8 is fixed to a lifting frame 7, which consists of a stationary and moving part (not shown in the diagram). Easy rotation of the turnplate 8 is ensured by ball bearings between the two parts.

A grooved turn-sleeve 9 is mounted on the lower stationary part of the turnplate 8, and engages with the turn pin 6 when the lifting frame is lowered.

Figure 4 shows a fixed stop 10, which is arranged on the upper plane of the moving part of turnplate 8, opposite to which are symmetrically arranged spring pins 11 and 12. The pins are dimensioned so as to be compressible only under the weight of a full bobbin 5, thus ensuring a fixed position of an empty bobbin 5 even in a slanting position of the turnplate 8, furthermore guides 13 and 14 for guiding the bobbin 5 during its rolling in and for keeping it in an appropriate position in relation to the yoke 4, and mobile rubber brackets 1 5 and 16 (not shown) are fastened to guides 13 and 14, which are formed in such a way, that in the course of swinging back the yoke 4, they can move in a cross-direction together with the contacting rim of the yoke.

The lifting frame 7 is preferably welded from a rolled section. The vertical movement of the lifting frame is ensured by guiding fixed guide rollers 17, 18, 19 and 20,21,22 in rails 23, 24 on the internal end surfaces of the stands 2 and 3 (as shown in Figures 1 and 2). Vertical movement of the lifting frame 7 without jamming is ensured by a suitable number and arrangement of the guide rollers. The minimum number of the guide rollers is three on each side, i.e. the use of a minimum of six guide rollers is necessary simultaneously on both sides. The stranded wire is arranged on the guide rollers fastened to the internal end surface of the strands and/or supporting block.

The lifting or lowering of the lifting frame 7 takes place with a hydraulic cylinder 25 (Figure 2) built into the supporting block 1, arranged with a hydraulic control unit in the space below the stands 2 and 3. The force exerted by the hydraulic cylinder 25 is transmitted to the supporting block by stranded wire 26 fixed to an end of the piston rod and to the two ends of the lifting frame 7 aided by guide rollers 27, 28, 29, 30, 31 fixed to the internal end surface of stands 2 and 3.

Figure 3 shows a door 32 with an (electrically locked) control device connected to the main control unit of the machine, which is arranged on the lower part of the buckling machine's servicing side. A rolling track 33 suitable for rolling the bobbin in and out is arranged on the supporting block 1 between the door 32 and turnplate 8.

According to further examples of the embodiment (not shown), movement of the lifting frame 7 takes place pneumaticaily, electromechanically, or hydraulically.

The examples set out hereinafter illustrate individual steps which may be used in putting the invention into practice: Example I Lifting in of an empty bobbin, Example II Lifting out of a full bobbin Example I In case of stationary buckling machine and horizontal position of the twisting frame, the electrically locked door 32 is opened -- preferably operated by a sensor on the rotary head and by the electrical control - and the rolling track 33 is lowered. The bobbin 5 is rolled onto the turnplate 8 by hand. The bobbin 5 remains on the turnplate 8 preferably in an oriented position in relation to the yoke 4, which is ensured by spring pins 11 and 12, and by guides 13 and 14.

After the door 32 has been closed, the lifting frame 7 is moved off in a vertical plane from its lower initial position towards the yoke, whilst the turnplate 8 is swung back into the horizontal plane. The turnplate is then turned automatically through 900 in relation to the vertical axis with the aid of the turn pin 6 and the turn-sleeve 9. The lifting frame 7 is actuated by the hydraulic cylinder 25, the force being transmitted by the stranded wire 26 with the aid of guide rollers 27, 28, 29, 30 and 31 to the two ends of the lifting frame 7.

Thus the lifting force exerts its effect in the direction of the lifting, which is the most favourable. The piston movement can be regulated as desired within very wide limits.

At the end of lifting into the yoke 4, the rubber brackets 1 5 and 1 6 on the turnplate 8 swing the yoke into the horizontal plane when necessary, or reduce the dynamic effect of the impact, due to incorrect static balance, or stoppage of the thread guide in any of its end positions. The yoke 4 swings out of the horizontal plane, because the bobbin 5 can be fixed only in this position. The bobbin 5 is fixed with the aid of manually actuated axially moving tapered tips. The lifting frame 7 is moved downward until it is in the lower initial position.

The buckling machine can be started only when the door 32 is closed and the lifting frame 7 is in the lower position, which is controlled by limit switches.

Example II When the bobbin 5 is full and the buckling machine is stationary, the electric control unit of the machine prevents the bobbin changing device from operation at the rotating machine, in accordance with those described in the lifting-in of the bobbin 5, the lifting frame 7 moves with the turnplate 8 to the lower plane, until impact, of the yoke 4. The bobbin 5 is released by hand, whereby the bobbin 5 is passed onto the turnplate 8, then, in the already described way, the lifting frame 7 is lowered to the lower initial position. Then the door 32 is opened and the rolling track 33 is lowered.

By this time the turnplate 8 is swung down in the direction of the rolling at a specific angle to the horizontal, and because of suitable statical dimensioning of the spring pins 11 and 12, the bobbin 5 is automatically rolled out of the rchine.

After bobbin changing, the buckling machine can be started again when the lifting frame 7 is in the lower initial position and the door 32 is closed.

Claims (6)

1. A cable industrial buckling machine having a closed supporting block, a yoke bearing supported at both ends to support the pulling and winding units, as well as a semi-automatic bobbin changing device, comprising a door on the lower part of stands facing the servicing side, ensuring the rolling-in and rolling-out of the bobbin arranged in the yoke, a lifting frame connected to rails fixed to the internal end surface of the stands with a minimum of three guide rollers for each stand and with a rope, said lifting frame having a turnplate built up from a stationary and moving part, a fixed stop arranged on the upper moving part of the turnplate, spring pins are in symmetrical arrangement opposite the said stop, compressible only under the weight of the full bobbin, parallel guides arranged perpendicularly to said spring pins, a grooved turn-sleeve on the lower stationary part of the turnplate, and a turn pin below the lifting frame fixed to the supporting block, and a drive actuating the lifting frame, as well as a rolling track arranged on the supporting block between the door and turnplate.

2. A cable industrial buckling machine as claimed in claim 1, wherein the drive is built into the space below the stands of the supporting block.

3. A cable industrial buckling machine as claimed in claim 1 or 2, wherein stranded wire is arranged on the guide rollers fastened to the internal end surface of the strands and/or supporting block.

4. A cable industrial buckling machine as claimed in claim 1, wherein the grooved turnsleeve ensures a 900 angular displacement in relating to the vertical axis.

5. A cable industrial buckling machine as claimed in claim 1 or 2, wherein the drive actuating the lifting frame is pneumatic, electromechanical or hydraulic.

6. A cable industrial buckling machine substantially as herein described with reference to the accompanying drawings.