GB2112031A

GB2112031A - Frictional finisher extended in the vertical plane with a single rove bobbin output

Info

Publication number: GB2112031A
Application number: GB08231602A
Authority: GB
Inventors: Giuseppe Saviolo
Original assignee: SANT ANDREA NOVARA OFFICINE
Current assignee: SANT ANDREA NOVARA OFFICINE
Priority date: 1981-11-05
Filing date: 1982-11-05
Publication date: 1983-07-13
Also published as: DE3240816A1; GB2112031B; FR2515700A1; FR2515700B1; BE894936A; IT8153770V0

Abstract

Two bobbin winders (8, 9) which are staggered in height are disposed downstream of each friction unit (7) and are each connected to a helical rove-guide twister supported by a horizontal bar (37) having an alternating movement in the longitudinal direction of the machine. The tubes (12, 13) on which the bobbins (14, 15) are formed each adhere to a drive roll (10, 11) and are supported by pairs of arms (16, 25) which rotate about axes parallel to the bar (37) and are dimensioned and disposed in such a way that the axes of the tubes (12, 13) follow, during the downward movement of the said pairs of arms, paths which intersect above a mobile hopper (23) designed to convey the formed bobbins on the tubes (12, 13) to a collection zone for these bobbins located at the rear portion of the machine. <IMAGE>

Description

SPECIFICATION Frictional finisher extended in the vertical plane with a single rove bobbin output The present invention relates to a frictional finisher extended in the vertical plane with a single rove bobbin output.

A frictional finisher extended in the vertical plane having a double rove bobbin output is already known.

This system is used as a result of the need to prevent elongations of roves during successive operations of unwinding of these roves from bobbins upstream of a spinning machine.

It is also known that the roves must be separated from one another on input into the spinning machine, and that their length is equal to half the length which a single rove wound on a bobbin of the same dimensions would have had.

This means that in the case of known finishing devices it is necessary to change the bobbins twice as often in order to supply the same weight of material to be spun to the spinning machine.

It is known that changing of the bobbins is a difficult manual operation which is tiring in the long term and which requires ability and skill. For this reason, this operation leads to time and production losses and is costly for the reasons mentioned above.

According to the present invention there is provided a frictional finisher extended in the vertical plane with a single rove bobbin output, characterised in that, downstream of each unit including frictional sleeves, there are disposed two bobbin winders, these winders being staggered in height and each winder being coupled to a roveguide twister of a helical type supported by a bar moving in an alternating manner in a direction parallel to the axis of the respective bobbin being formed.

The invention will be described by way of example with reference to the accompanying drawings, wherein: Figure 1 is a diagrammatic lateral elevation of a frictional finisher extended in the vertical plane embodying the invention; Figure 2 is a partial cross-section, on an enlarged scale, of the apparatus shown in Figure 1; Figure 3 is a partial view in the direction of the arrow III shown in Figure 2; and Figure 4 is a section similar to that of Figure 2 showing the frictional finisher with a different arrangement of the output bobbins.

Those elements which are the same in all the Figures are designated by the same reference numerals.

The frictional finisher shown in the drawings comprises a base 1 in the upper portion of which there are disposed roller devices 2, each of which is designed to stretch a pair of roves 3 and 4 respectively. These roves are supplied from vessels 5 and 6 respectively disposed upstream of the rollers 2. The latter are of the type which are extended in the vertical plane and are disposed such that the roves 3 and 4 subjected to the stretching operation follow vertical paths, i.e.

being provided with a downward displacement.

Each of the rollers 2 is disposed above a friction unit 7, also extended in the vertical plane, comprising two pairs of internally scored sleeves mounted on grooved rolls.

At the output of these friction units 7, the roves 3 and 4 are supplied downwardly in the direction of two bobbin winders 8 and 9 respectively which are staggered in height.

Each of the bobbin winders or winder devices comprises a controlled drive roll, respectively 10 and 11, whose horizontal axis is parallel to the longitudinal direction of the machine.

On the periphery of each of these drive rolls 10 and 11 there is attached a tube 12, 13 respectively on which the bobbins are to be formed.

The drive rolls 11 of the lower winder 8 are disposed so as to be approximately tangential to the vertical plane V at which there is contact between the external surface of the sleeves belonging to the various friction units.

The drive roll 10 of the upper winder 9 is located on the other side of the above-mentioned plane V and is staggered in height with respect to the drive roll 11 of the lower winder.

The tube 12 on which the lower bobbin 14 is to be formed, by means of the winding on this tube of the rove 3 which continues to be displaced substantially downwardly after discharge from the friction unit 7, adheres directly to the drive roll 11 at the beginning of formation of the bobbin as shown in dot-dash lines in Figure 2.The tube is supported by a pair of identical arms 1 6 supported by truncated shaft 1 7 mounted rotatably in the frame of the machine and which may be driven in rotation by means of a chain which acts on the sprocket 1 8 rigid with the shaft 1 7. These arms are joined to the shaft 17 with the interposition of transverse fulcrums 10 which enable a reciprocal distancing of the respective end portions in order to disengage the tube 12 with the bobbin 1 4 formed thereon, against the resistenace of the traction springs enclosed in the housings 20.

This distancing takes place at the end of the displacement of the arms 1 6, the tubes 12 and the bobbins 14 supported thereon, towards the position shown diagrammatically by 22 in Figure 2.

In this position the bobbin is discharged, in a known manner, into a hopper 23 which is then caused to rotate and supplies the bobbin to the rear part of the machine at which there is located a collection zone for the formed bobbins. At this point a new tube 12 supplied by the charger 23 is raised towards the arms 16, in a manner known per se, after which the arms 1 6 return to the initial position in which the tube 12 adheres to the drive roll 11 under the action of a thrust produced by the tension of a spring (not shown) acting on one of the said arms 16. The tube 13 which adheres to the drive roll 10 of the upper winder 9 is designed to form the bobbin 1 5 and has wound on it the rove 4 which is discharged from the friction unit 7 and is displaced along a path which is slightly inclined with respect to vertical.This tube 1 3 may rotate, whilst being maintained parallel to itself, about an axis whose position is selected such that the tube 1 3 may reach, at the end of its descent following the end of formation of the bobbin on this tube, the position coinciding with the position 22 mentioned above which the tube 12, on which the lower bobbin 14 is formed, occupies at the end of its descent to the moving hopper 23.

In order to enable the above, each tube 1 3 is rotatably mounted on pivots projecting towards one another from the end portions of the arms 25, which are similar to the arms 16, and rotate about transverse fulcrums 26. The latter are supported at the opposite ends of the central arm of frames 27 having the shape of an inverted "U", having the ends of the respective lateral arms mounted rotatably on pins 28 supported by brackets 29 rigid with the fixed frame of the machine. One of these lateral arms has fixed to it a sprocket 30 controlled at the required time by a chain in order to cause the rotation of the mobile support of the tubes 13 on which the upper bobbins 1 5 are formed.

The system for engaging and disengaging the tubes 1 3 from the arms 25 of the respective rotary support system is identical to that which is known per sue and used for the engagement and disengagement of the tubes 12 on which the lower bobbins 14 are formed.

The frames 27 supporting the arms 25 are dimensioned such that they do not interact with the arms 1 6 of the lower winder 8 or with the bobbin 1 4 formed by the latter. For this reason the parallel end arms of the inverted "U" frame 27 are displaced in planes located externally to the arms 16 with respect to the median vertical plane of each of the winders 8 and 9.

In the vicinity of each of the drive rolls 10 and 11 there is disposed a rove-guide twister device comprising an input funnel constituted by a ring 31 provided with a radial cut-out. This ring has fixed to it one end of a round bar 33 shaped as a helix, preferably having a zero internal diameter, and whose other end supports the so-called "condenser". The latter has the shape of a bushing whose through hole has a diameter which tapers in the direction of the output facing the contact zone between the drive rolls 10 and 11 and the tubes 1 2 and 1 3 or the periphery of the respective bobbin being formed.

The condenser body is clamped from the outside by a clamp supported by the upper member of a cursor. The latter is fixed by means of the locking block to a bar having a circular crosssection, provided with an alternating movement for example an alternating movement having the speed and amplitude of the latter strokes which may be varied under the control of the known mechanism (not shown) supported by the frame of the machine.

In summary, the illustrated frictional finisher has as the output of each friction unit two bobbins, one being located at a higher level and one at a lower level, these bobbins being supported by independent pairs of arms. One of the roves, emerging from each of the friction units is wound on the lower bobbin and the other rove on the upper bobbin.

A the time of "removal", i.e. when the bobbin has been formed and has reached the measurement predetermined by the machine, the arms supporting the lower bobbin rotate automatically in the first instance discharge this bobbin and take up a new tube, returning finally to the starting position. The support elements for the upper bobbin then rotate, discharge the bobbin, take up a new tube and return to the starting position.

At this point the machine may start a new cycle.

It is obvious that the time required for the formation of each of the bobbins may be more than double that required for the formation of the bobbins in frictional finishers in which the output bobbins are of the double-rove type. This is a considerable advantage as it reduces the number of stoppages of the machine required for changing the bobbins.

Claims

1. A frictional finisher extended in the vertical plane and having a single rove bobbin output, comprising frictional sleeves and two winders, the winders being downstream of the frictional sleeves, said winders being offset in height and each being connected to a rove-guide twister of a helical type, supported by a bar having an alternating movement in the longitudinal direction of the machine.

2. A frictional finisher as claimed in claim 1, wherein tubes on which the bobbins are formed are supported by a pair of arms which rotate about axes disposed such that the axes of tube-holder pins of these pairs of arms follows, during their downward movement at the end of formation of the bobbins, paths which intersect above a moving collection hopper which transfers discharge bobbins to collection zone for the formed bobbins located at the rear portion of the machine.

3. A frictional finisher as claimed in claim 2, wherein a drive roll of a lower one of the two winders is substantially tangential with respect to a vertical plane which passes through a contact zone between external surfaces of the frictional sleeves which cooperate with one another, said drive roll being disposed on the side of the said plane facing a rear portion of the machine, a drive roll of the upper winder being disposed on the other side of this plane.

4. A frictional finisher as claimed in any one of claims 1 to 3, wherein the tube on which the upper bobbin is formed is supported by arms similar to arms which support the tube on which the lower bobbin is formed, articulated about end portions of a horizontal arm of an inverted U frame articulated with the ends of its respective lateral arms on pins which are coaxial and supported by brackets projecting from a frame of the machine.

5. A frictional finisher as claimed in claim 1, characterised in that drive rolls and respective tubes on which the respective upper and lower bobbins are formed, are disposed perpendicular to a longitudinal dierection of the machine.