GB2098962A

GB2098962A - Conical bobbin sleeves

Info

Publication number: GB2098962A
Application number: GB8213330A
Authority: GB
Original assignee: Hacoba Textilmaschinen GmbH and Co KG
Current assignee: Hacoba Textilmaschinen GmbH and Co KG
Priority date: 1981-05-27
Filing date: 1982-05-07
Publication date: 1982-12-01
Also published as: DE3121022C2; IT1156018B; FR2506740B1; DE3121022A1; FR2506740A1; IT8267671A0

Abstract

Conical bobbin sleeves (1) are provided with spacing means (2) projecting from their cone surfaces to prevent a number of such conical bobbin sleeves stacked one on another from jamming on one another. To prevent damage to the bobbin sleeves when they are stacked and to simplify as far as possible the devices on which the the bobbin sleeves are mounted for winding, the spacing means comprises an annular protuberance (2), such as a bead, on the outside surface (1') of the cone. The annular bead (2) may alternatively be positioned at the larger diameter end (1'') of the bobbin sleeve. The annular protuberance may be formed integrally with the sleeve, or may be in the form of a ring, e.g. a tubular spring, inserted into an annular recess in the sleeve, or may consist of an outwardly projecting annular flange of a hollow insert member inserted into the smaller diameter end of the sleeve. <IMAGE>

Description

SPECIFICATION Conical bobbin sleeves This invention relates to conical bobbin sleeves, commonly referred to in the textile trade as "cones", which include spacing means standing proud of the cone surface and serving to prevent jamming together of stacked bobbin sleeves.

For the winding of yarns, threads, strips, wires and the like bobbin sleeves of various different shapes are used. In particular, conical bobbin sleeves with different conicity are frequently used, for example with cone angles of 3030". 4020", 5057", 9015" etc. All these bobbin sleeves are normally hollow and generally have only a small wall thickness. They are almost always made of plastics material or paper. With the exception of the conical bobbin sleeve with a 9015" cone angle, which is closed at its smaller diameter end, the other conical bobbin sleeves as a rule are open at the end of the sleeve which has the smaller diameter. Such bobbin sleeves are used in large numbers both for in-house winding processes and also for bobbins for public sale.

For installation in the winding device the conical bobbin sleeves which are open at both ends are either mounted on a spindle which is matched to the conicity of the sleeve, or they are mounted to be easily rotatable on a receiving body, for example on shouldered plates, matched to correspond to the internal diameter of the bobbin sleeve. In many cases such bobbin sleeves are used repeatedly. To identify the yarn, thread or the like which has been wound on, it is usual to put a self-adhesive label at the end of the bobbin sleeve which has the larger diameter.

If such conical bobbin sleeves are stacked one on another for transportation or for their storage, because of their uniformity of shape there is a tendency for them to stick together, since the internal surface of the outer bobbin sleeve lies in full surface contact with the external surface of the inserted inner bobbin sleeve because they have the same taper. This is extremely disadvantageous. Since as a rule the manufacturer of bobbin sleeves is not also the end user of the bobbin sleeves, problems arising from the tendency of the sleeves to jam together already begin when the sleeves are transported. The newly delivered conical bobbin sleeves can therefore generally only be transported packed in a disordered manner, which means as a result that the packing space is only very inefficiently used.In the feeding of bobbin sleeves to the winding device, and also in the internal labelling which is usually carried out before the winding process, this passable mutual sticking together of the conical bobbin sleeves is likewise of considerable disadvantage since because of this the feeding and supply of the bobbin sleeves cannot be accomplished fully automatically or semiautomatically.

In order to avoid the mutual sticking together of the sleeves when such conical bobbin sleeves are stacked within one another, it has already been proposed to provide a spacing means in the form of one or even two protuberances standing proud of the cone surface on the inside of the bobbin sleeve at the smaller diameter end of the sleeve, these protuberances being positioned so that and being of such a size that an identical bobbin sleeve inserted into a first bobbin sleeve strikes against the projecting spacing members before the conical surfaces of the two stacked bobbin sleeves can contact each other over a broad area. These protuberances are either round pips or alternatively thin ribs which extend axially on diametrically opposed sides of the internal surface of the cone towards the end of the sleeve which has the smaller diameter.It is true that by means of these spacing members the mutual sticking of the conical bobbin sleeves in one another when they are stacked can be avoided, but nevertheless they do give rise to other disadvantages. Thus, if a very great number, for example about 50 or more, of these conical bobbin sleeves with internal spacing members are stacked one on another, there is the danger, if the bobbin pile so formed is axially compressed or struck, as must always be expected both in transportation and also in the supply of such bobbin sleeves to labelling machines or winding machines, that damage to the top edges of the bobbin sleeves will be caused.As a result of the pressure or compression exerted on the stacked conical bobbin sleeves the top edges of the inner bobbin sleeves pressed against the spacing elements are broken down at points or along lines, and are only all too easily damaged by this. Such damage can considerably impair the trouble-free delivery of the wound yarn, thread or the like. If such conical bobbin sleeves with internally provided spacing elements are mounted on a winding spindle which is matched to the conicity of the bobbin sleeve, then these internal spacing elements, regardless of what form they take, are disadvantageous in every case, since either the take-up spindle must be correspondingly shouldered in respect of its diameter or alternatively must be correspondingly recessed in order to be able to accept the spacing elements.

It is an object of the present invention to provide a conical bobbin sleeve with spacing means serving to prevent the jamming together of stacked sleeves which does not have the aforementioned faults, but which on the contrary makes it possible to achieve the stacking of a plurality of such bobbin sleeves without danger of damaging them and also in a manner which requires no specially recessed or shaped bobbinreceiving spindles.

This is achieved in accordance with the present invention by a conical bobbin sleeve with spacing means standing proud of the cone surface to prevent jamming of the sleeve, in which the spacing means comprises an annular protuberance from the outer face of the cone.

Preferably, the annular protuberance is a bead at the end of the sleeve which has the smaller diameter, in which case the annular bead preferably extends as a collar around the top edge of the conical bobbin sleeve. The bead can have a semi-circular cross-section or alternatively have a trapezoidal or conical cross-section.

Preferably, the annular protuberance is formed integrally with the sleeve cone, i.e. it is made of the same material as the sleeve cone itself, for example of an injection moulded plastics material.

The protuberance can alternatively be a ring set into an annular recess, e.g. a groove, in the sleeve cone. Alternatively the protuberance may comprise an external flange at the outer end of an insert member which has a, preferably hollow, spigot inserted into the smaller diameter end of the sleeve cone.

If the annular protuberance which stands proud of the conical outer surface of the bobbin sleeve and which prevents jamming of the stacked sleeves is formed integrally with the sleeve cone and is made in one working process, for example is injection moulded from plastics material, the outer sleeve of the injection mould must be divided as far as possible, in order to be able to extract the thus formed conical bobbin sleeve from the mould. However, this is not absolutely necessary, and especially if the annular protuberance does not broaden in size towards the smaller diameter end of the bobbin sleeve, but hds the same diameter or even extends in a tapering manner, in which case the cone angle of the annular protuberance will naturally be smaller than the cone angle of the bobbin sleeve in order to be able to serve as an anti-jamming means.

Conical bobbin sleeves with the aforementioned features of the present invention can be stacked one inside another without any problem, without the sleeves sticking to one another or being damaged. Since the inside of the conical bobbin sleeve is completely smooth and without any projecting pips, ribs or other like spacing elements, the conical bobbin sleeve with the externally provided annular protuberance can be mounted both on winding spindles with matched conical spindle chucks and also in an equivalent way on winding devices with pick-up plates on both sides.If the conical bobbin sleeve of the present invention is to be fitted on to a winding device in which the sleeve in the empty state lies flat on the winding cylinder or the winding drum, either the winding cylinder or the winding drum is correspondingly shouldered laterally, or alternatively the winding cylinder or the winding drum has a correspondingly recessed groove at the position where the annular protuberance sits.

The annular protuberance can be provided at other positions on the outer surface of the cone, especially, as an alternative, at the larger diameter end of the bobbin sleeve, in which case it then as a rule has a somewhat larger axial extent in order to ensure the desired distancing effect of the stacked bobbin sleeves.

According to a preferred feature of the invention a slot is provided in the sleeve at the larger diameter end of the sleeve for the withdrawal of material wound on the sleeve over the protuberance at the other end of the sleeve, down through the interior of the sleeve, and through the slot. The annular protuberance provided at the smaller diameter end of the bobbin sleeve here offers also the advantageous possibility of frictionless withdrawal of a thread from the interior of the bobbin sleeve through the slot which is provided at the iarger diameter end of the sleeve.This form of thread withdrawal has the advantage, as compared with the more usual overhead withdrawal, that the thread delivery from the conical bobbin winding takes place in practice without the formation of thread balloons, so that such thread withdrawal can take place from bobbins which are comparatively close to one another without the yarns becoming entangled one with another.

In order that the invention may be fully understood a number of embodiments of conical bobbin sleeve in accordance with the invention will now be described by way of example and with reference to the accompanying drawings, in which: Fig. 1 is a sectional view through a number of conical bobbin sleeves stacked one inside another and each provided with an annular bead at the smaller sleeve end; Figs. 2 and 3 are partia! views of conical bobbin sleeves with other forms of annular bead; Fig. 4 shows a conical bobbin sleeve provided with a wound thread and with thread withdrawal taking place from the interior of the sleeve; and Fig. 5 shows a number of stacked bobbin sleeves each with an annular protuberance provided at the larger diameter sleeve end.

The conical bobbin sleeves 1 shown in Fig. 1 are each provided with an annular bead 2 projecting proud of the external surface 1' of the cone, these beads being positioned at the smaller diameter end of each sleeve. These annular beads 2 ensure that when a number of such conical bobbin sleeves 1 are stacked one on another each covered bobbin sleeve of the stack always only has its upper annular bead 2 in contact with the internal surface of the bobbin sleeve which lies immediateiy over it, while the neighbouring cone faces remain free, i.e. a corresponding conical gap 3 is created between the two sleeves. As shown, the annular beads 2 can be semi-circular in crosssection. Alternatively, the beads can have some other shape, for example conical or trapezoidal.

The annular beads 2 are formed as one piece, i.e.

integrally, with their associated bobbin sleeves 1.

This can be accomplished especially easily by an injection moulding process using plastics material.

As is shown in Fig. 2, the annular bead can be formed by a ring 5 inserted into an annular recess 4, for example a groove, in the bobbin sleeve 1.

The ring 5 can be a tubular spring for example.

In the case of the embodiment shown in Fig. 3, the annular bead forming the anti-jamming means is formed by an outwardly projecting annular flange 6 of an insert member 7 which comprises a, preferably hollow, spigot 8 which is inserted into the smaller diameter end 1" of the conical bobbin sleeve 1.

The annular bead 2, 5 or 6 provided at the smaller diameter end of the bobbin sleeve not only serves positively as a spacing and anti-jamming member, but also opens up the advantageous possibility of being able to withdraw the thread from the interior of the bobbin sleeve, as is shown in Fig. 4. For this purpose a keyhole slot 9 is provided at the larger diameter end 1 "' of the conical bobbin sleeve. The thread 11 coming from the yarn coii 10 is threaded into and withdrawn through this keyhole slot 9 after being fed down through the interior 1 2 of the bottin sleeve 1.This type of thread withdrawl has the great advantage that it can be carried out with practically no ballooning of the yarn around the upper withdrawal end of the yarn coil 10, as is generally the case with axial overhead withdrawal of the yarn. it will be appreciated that the holder or mandrel for the would yarn spool shown in Fig. 4 has an appropriate character so that it does not hinder the withdrawal of the thread through the interior of the bobbin sleeve.

In the embodiment shown in Fig. 5 the annular protuberances 2' projecting from the external surface of the cones are each provided at the larger diameter end 1"' of the respective sleeves.

These protuberances are so formed that in this case also a conicaffree space 3 is left between each pair of stacked bobbin sleeves 1, so that the stacked sleeves do not come into contact with one another over a broad surface and therefore cannot become jammed on each other.

Claims

1. A conical bobbin sleeve with spacing means standing proud of the cone surface to prevent jamming of the sleeve, in which the spacing means comprises an annular protuberance from the outer face of the cone.

2. A bobbin sleeve as claimed in claim 1, in which the annular protuberance is a bead at the smaller diameter end of the sleeve.

3. A bobbin sleeve as claimed in claim 1 or 2, in which the annular protuberance is formed integrally with the sleeve cone.

4. A bobbin sleeve as claimed in claim 1 or 2, in which the annular protuberance comprises a ring set into an annular recess in the sleeve cone.

5. A bobbin sleeve as claimed in claim 1 or 2, in which the annular protuberance comprises an external flange at the outer end of an insert member which has a spigot inserted into the smaller diameter end of the sleeve cone.

6. A bobbin sleeve as claimed in claim 1 or 3, in which the annular protuberance is provided at the larger diameter end of the sleeve.

7. A bobbin sleeve as claimed in any of claims 1 to 5, in which a slot is provided in the sleeve at the larger diameter end of the sleeve for the withdrawal of material wound on the sleeve over the annular protuberance at the other end of the sleeve, down through the interior of the sleeve, and through the slot.

8. A conical bobbin sleeve substantially as hereinbefore described with reference to any one of the Figures of the accompanying drawings.