GB1572499A

GB1572499A - Bobbins

Info

Publication number: GB1572499A
Application number: GB714476A
Authority: GB
Original assignee: Platt Saco Lowell Ltd
Current assignee: Platt Saco Lowell Ltd
Priority date: 1977-02-04
Filing date: 1977-02-04
Publication date: 1980-07-30

Description

(54) BOBBINS (71) We, PLAIT SACO LOWELL LIMITED, a British Company of Holcombe Road, Helmshore, Rossendale, Lancashire, BB4 4NG, England, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to bobbins for winding elongate material, particularly of the kind which include a toothed member for trapping the elongate material.

In British Patent Specification No.

1522143 is described a method of transferring a winding roving from a full package to an empty bobbin, wherein the bobbin is provided with axially projecting teeth conveniently mounted within a groove for trapping the roving during the transfer. In British Patent Specification No. 1 097 204 is disclosed a similar system for winding yarn. The teeth for simplicity of manufacture are provided upon a toothed strip.

One problem which has been encountered with these systems is the adequate mounting of the toothed strip on the bobbin bearing in mind the requirement to keep as low as possible the cost of the bobbins.

The invention provides a bobbin comprising a cylindrical portion, a broken ring of toothed wire, for trapping the elongate material, which is formed of a resilient material so as to be openable and passed around the cylindrical portion so as to spring back to its original ring shape to be spring clipped onto the cylindrical portion to extend therearound, and co-operating abutments provided on the broken ring and the cylindrical portion for preventing rotation of the broken ring relative to the cylindrical portion.

The abutments on the toothed member preferably comprise depending portions which extend substantially radially of the cylindrical portion to engage shoulders provided thereon. For advantage, the cylindrical portion may include a groove extending around the circumference of the cylindrical portion into which the toothed member is mounted.

Preferably the toothed member comprises a broken ring of hardened card wire which extends around the full circumference of the cylindrical portion and is arranged such that the teeth point substantially axially of the cylindrical portion.

In a particularly preferred embodiment, the depending portions are formed by bending the ends of the ring of card wire at right angles to extend into a recess provided in the cylindrical portion at the groove.

In an alternative preferable arrangement, in which the toothed member extends only partly around the circumference, there may be provided one or more further toothed members which together complete the full circumference. Preferably there are two toothed members each constituting 1800C and each end of each of which includes a depending portion for engagement in a respective one of a pair of recesses provided on the cylindrical portion 1800 apart.

One embodiment of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a section through a part of a bobbin according to the invention with the toothed strip removed; Figure 2 is an end view of the toothed strip; Figure 3 is an enlarged portion of the section of Figure 1 and including the toothed strip; and Figure 4 is a plan view of a portion of the toothed strip showing the teeth.

A bobbin primarily for winding roving in apparatus as described in aforementioned British Patent Specification No. 1522143 comprises a cylindrical body onto which the roving is wound to form a roving-build package. A portion of the cylindrical body is shown at 10 in Figure 1. The body is prefer ably formed of a moulded plastics material.

A groove 11 is formed circumferentially of the cylindrical body 10 for receiving a broken ring 20 of hardened resilient card wire shown in Figures 2 and 4. The ends 21 of the portion of card wire forming the ring 20, are bent at right angles to the ring to point radially inwardly. The resilience of the hardened card wire allows the ring 20 to be opened sufficiently to fit over the cylindrical portion and to spring back to be spring clipped onto thecylindrical portion in the groove. A recess 12, which may be blind or bored through to the hollow interior of the bobbin, is provided in the bobbin at the groove 11 to receive the ends 21 and to provide shoulder which hold them against movement angularly relative tothe axis. In this way, the ring 20 is prevented from rotational movement relative to the bobbin and also is prevented from being inadvertently sprung from the bobbin.

Referring now to Figure 3, the groove 11 comprises a first right angled groove 13 and adjacent shoulder 14 for respectively receiving the base 22 and supporting the toothed portion 23 of the conventional card wire ring 20. Each tooth 24 thus projects over and partly closes a second groove 15 which in use receives the roving to be transferred to the bobbin. The lead-in edge of the groove 15 is inclinedat 45" to the surface of the bobbin to allow the roving to slide into the groove to be trapped beneath the teeth 24 of the ring 20.

When the card wire is rolled into the ring 20, its cross-section causes the teeth 24 to point inwardly at a small angle of about 15".

This occurs when the wire is rolled in the direction such that the toothed portion 23 lies at the outermost edge of the base portion 22. This arrangement provides the advantage of directing the teeth out of engagement with the hands of an operative handling the bobbin.

Furthermore this embodiment has considerable advantages. Firstly it allows the use of conventional card wire to provide the toothed strip which is inexpensive and readily available. Secondly it keeps to a minimum the time and difficulty of assembling the bobbin and wire since it avoids the use of adhesive or other complications. Thirdly it enables damaged or worn toothed strips to be readily removed and replaced.

The card wire is of a conventional form having pointed teeth which have a component of inclination in the circumferential direction of the bobbin. Two card wire rings 20 may be provided in respective adjacent grooves 11, the second providing a back-up should the roving not be trapped in the first groove. WE WHAT WE CLAIM IS: 1. A bobbin for winding elongate material comprising a cylindrical portion, a broken ring of toothed wire, for trapping the elongate material, which is formed of a resilient material so as to be openable and passed around the cylindrical portion so as to spring back to its original ring shape to be spring clipped onto the cylindrical portion to extend there around, and co-operating abutments provided on the broken ring and the cylindrical portion for preventing rotation of the broken ring relative to the cylindrical portion.

2. A bobbin as claimed in claim 1, wherein the abutments on the toothed wire comprise- depending portions which extend substantially radially of the cylindrical portion to engage shoulders provided thereon.

3. A bobbin as clairned in claim 2, wherein the depending portions are formed by bending the ends of the toothed wire at right angles thereto.

4. A bobbin as claimed in claim 2 or 3, wherein the shoulders are provided by a recess formed in the cylindrical portion.

5. A bobbin as claimed in any preceding claim, wherein the cylindrical portion has a groove extending around its circumference in which the toothed wire is mounted.

6. A bobbin as claimed in any preceding claim, wherein the toothed wire comprises a broken ring of hardened card wire having a base and a toothed portion.

7. A bobbin as claimed in claims 5 and 6, wherein the groove includes a first circumferential groove part for receiving the base of the card wire and a circumferential shoulder for supporting the toothed portion of the card wire.

8. A bobbin as claimed in any preceding claim, wherein the teeth are directed inwardly at a small angle to the axial direction.

9. A bobbin as claimed in any preceding claim, including two toothed members provided in respective adjacent grooves.

10. A bobbin substantially as hereinbefore described with reference to the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. ably formed of a moulded plastics material. A groove 11 is formed circumferentially of the cylindrical body 10 for receiving a broken ring 20 of hardened resilient card wire shown in Figures 2 and 4. The ends 21 of the portion of card wire forming the ring 20, are bent at right angles to the ring to point radially inwardly. The resilience of the hardened card wire allows the ring 20 to be opened sufficiently to fit over the cylindrical portion and to spring back to be spring clipped onto thecylindrical portion in the groove. A recess 12, which may be blind or bored through to the hollow interior of the bobbin, is provided in the bobbin at the groove 11 to receive the ends 21 and to provide shoulder which hold them against movement angularly relative tothe axis. In this way, the ring 20 is prevented from rotational movement relative to the bobbin and also is prevented from being inadvertently sprung from the bobbin. Referring now to Figure 3, the groove 11 comprises a first right angled groove 13 and adjacent shoulder 14 for respectively receiving the base 22 and supporting the toothed portion 23 of the conventional card wire ring 20. Each tooth 24 thus projects over and partly closes a second groove 15 which in use receives the roving to be transferred to the bobbin. The lead-in edge of the groove 15 is inclinedat 45" to the surface of the bobbin to allow the roving to slide into the groove to be trapped beneath the teeth 24 of the ring 20. When the card wire is rolled into the ring 20, its cross-section causes the teeth 24 to point inwardly at a small angle of about 15". This occurs when the wire is rolled in the direction such that the toothed portion 23 lies at the outermost edge of the base portion 22. This arrangement provides the advantage of directing the teeth out of engagement with the hands of an operative handling the bobbin. Furthermore this embodiment has considerable advantages. Firstly it allows the use of conventional card wire to provide the toothed strip which is inexpensive and readily available. Secondly it keeps to a minimum the time and difficulty of assembling the bobbin and wire since it avoids the use of adhesive or other complications. Thirdly it enables damaged or worn toothed strips to be readily removed and replaced. The card wire is of a conventional form having pointed teeth which have a component of inclination in the circumferential direction of the bobbin. Two card wire rings 20 may be provided in respective adjacent grooves 11, the second providing a back-up should the roving not be trapped in the first groove. WE WHAT WE CLAIM IS:

1. A bobbin for winding elongate material comprising a cylindrical portion, a broken ring of toothed wire, for trapping the elongate material, which is formed of a resilient material so as to be openable and passed around the cylindrical portion so as to spring back to its original ring shape to be spring clipped onto the cylindrical portion to extend there around, and co-operating abutments provided on the broken ring and the cylindrical portion for preventing rotation of the broken ring relative to the cylindrical portion.