GB2104873A - Bobbin - Google Patents

Abstract

To enable the automatic anchoring of a roving (4), a bobbin (1) has at least one region (2) provided with integrally moulded projections (3) shaped and arranged to capture the roving (4) as the bobbin (1) rotates. The region (2) is recessed and the projections (3) may be triangular or hook shaped in cross section. <IMAGE>

Description

SPECIFICATION Bobbin The present invention refers to a bobbin or core for winding yarn, roving or the like. It particularly relates to a bobbin for use with automatic winding on or take-up.

When full bobbins are replaced by empty ones on a roving frame, an operation known as "doffing", in the conventional procedure, the operator takes the full bobbins off the spindles and replaces them with empty ones. He has then to fix the end of the rovings to the respective bobbin surfaces, winding some coils manually to assure the rovings are well fixed to the bobbin, so that when the spindles start revolving the bobbin will pull and wind the roving round, assuring in this way a correct roving package. Nevertheless, in spite of the operator's skill this manual operation is difficult, increasing production time and consequently production costs.

Some attempts had been made in the past to overcome this problem by using a bobbin provided with an annular recess in which there is felt or plush or other material which can provide a certain degree of roughness or rugosity, such that the roving can adhere to this surface and so be wound on when the machine was started up.

However, this type of bobbin has a number of disadvantages, such as wear of the felt or other material so that it loses its effectiveness.

Furthermore, the material has to be cemented on the surface of the bobbin, and often becomes loose after some time of usage. Another inconvenience when using this type of bobbin is that after the bobbin is unwound, it requires cleaning due to roving fibres adhered to the bobbin surface.

According to the present invention there is provided a spinning bobbin whereof at least a portion of the winding surface has integral projections, providing a rough surface for the automatic anchoring of the first winding coils.

The integral projections provide a suitable rough area for hooking or anchoring the first roving coils, so that it may be possible to effect automatic winding of the first roving coils on the empty bobbin after doffing.

A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which: Fig. 1 is a side view of a bobbin; Fig. 2 is a cross-section of the bobbin on a larger scale, at the toothed region; Figs. 3, 4 and 5 show various types of projections or teeth; and Fig. 6 is a cross-section of the bobbin in use on a roving frame, showing the taking-up of the roving.

The spinning bobbin or bobbin tube shown in the drawing has a tubular body 1 formed in one piece from suitable material, e.g. by moulding. It has generally the normal shape and dimensions of a conventional bobbin except for a region 2. This extends for some length adjacent the lower end of the tube. Its outer surface is substantially cylindrical and of smaller diameter than the bulk of the tube, but provided with projections. As shown in Fig. 1 these have the form of points or needles 3, but any other form, e.g. prongs or teeth, can be used, so long as they provide the necessary rugosity or roughness. The projections 3 are integral with the tube 1, e.g. being formed in the moulding process.

The projections 3 can be of different configurations, regular or irregular. By way of example, Figs. 3 to 5 show three forms. Fig. 3 shows a continuous saw-tooth pattern, in which all point in the same direction. Fig. 4 shows more complex teeth: a simple triangular tooth as seen in Fig. 3 is provided with a tang so that it resembles a barbed hook. Fig. 5 is a simple array of spaced teeth, each being a symmetrically disposed isosceles triangle.The lengths and thicknesses or ranges thereof, and the angles of the projections to the tube circumference can be chosen according to the requirements. (Both the angle of a projection to a radius of the tube and to the iongitudinal direction of the tube are open to selection.) As compared with the known bobbin tubes the tubes embodying the invention can offer the following advantages: a) The zone provided with projections 3 always maintains its structure, configuration and shape as it is an integral part of the tube itself.

b) The fibres which adhere to the tube anchoring zone 2 when the roving 4 is wound round may easily be detached when the bobbin is emptied. No separate cleaning step is necessary.

c) The cost of the bobbin tube with the automatic winding zone is practically the same as the cost of a conventional bobbin with no fixing zone because no special operation or additional parts are necessary.

d) The risk of detachment of the projections (as happens with bobbins using felt etc.) is virtually eliminated, by having the needles or hooks moulded with the bobbin in one piece.

Such factors as the materials employed to make the tube, its shape and dimensions, the extent and disposition of the area or areas with projections, and the degree(s) of rugosity or roughness of these can be varied, as will be understood by those skilled in the art.

Claims

1. A spinning bobbin whereof at least a portion of the winding surface has integral projections, providing a rough surface for the automatic anchoring of the first winding coils.

2. A bobbin according to claim 1 wherein the bobbin with its projections is produced by moulding.

3. A bobbin according to claim 1 or 2 wherein the projections are provided in at least one annular recessed region.

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

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Bobbin The present invention refers to a bobbin or core for winding yarn, roving or the like. It particularly relates to a bobbin for use with automatic winding on or take-up. When full bobbins are replaced by empty ones on a roving frame, an operation known as "doffing", in the conventional procedure, the operator takes the full bobbins off the spindles and replaces them with empty ones. He has then to fix the end of the rovings to the respective bobbin surfaces, winding some coils manually to assure the rovings are well fixed to the bobbin, so that when the spindles start revolving the bobbin will pull and wind the roving round, assuring in this way a correct roving package. Nevertheless, in spite of the operator's skill this manual operation is difficult, increasing production time and consequently production costs. Some attempts had been made in the past to overcome this problem by using a bobbin provided with an annular recess in which there is felt or plush or other material which can provide a certain degree of roughness or rugosity, such that the roving can adhere to this surface and so be wound on when the machine was started up. However, this type of bobbin has a number of disadvantages, such as wear of the felt or other material so that it loses its effectiveness. Furthermore, the material has to be cemented on the surface of the bobbin, and often becomes loose after some time of usage. Another inconvenience when using this type of bobbin is that after the bobbin is unwound, it requires cleaning due to roving fibres adhered to the bobbin surface. According to the present invention there is provided a spinning bobbin whereof at least a portion of the winding surface has integral projections, providing a rough surface for the automatic anchoring of the first winding coils. The integral projections provide a suitable rough area for hooking or anchoring the first roving coils, so that it may be possible to effect automatic winding of the first roving coils on the empty bobbin after doffing. A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which: Fig. 1 is a side view of a bobbin; Fig. 2 is a cross-section of the bobbin on a larger scale, at the toothed region; Figs. 3, 4 and 5 show various types of projections or teeth; and Fig. 6 is a cross-section of the bobbin in use on a roving frame, showing the taking-up of the roving. The spinning bobbin or bobbin tube shown in the drawing has a tubular body 1 formed in one piece from suitable material, e.g. by moulding. It has generally the normal shape and dimensions of a conventional bobbin except for a region 2. This extends for some length adjacent the lower end of the tube. Its outer surface is substantially cylindrical and of smaller diameter than the bulk of the tube, but provided with projections. As shown in Fig. 1 these have the form of points or needles 3, but any other form, e.g. prongs or teeth, can be used, so long as they provide the necessary rugosity or roughness. The projections 3 are integral with the tube 1, e.g. being formed in the moulding process. The projections 3 can be of different configurations, regular or irregular. By way of example, Figs. 3 to 5 show three forms. Fig. 3 shows a continuous saw-tooth pattern, in which all point in the same direction. Fig. 4 shows more complex teeth: a simple triangular tooth as seen in Fig. 3 is provided with a tang so that it resembles a barbed hook. Fig. 5 is a simple array of spaced teeth, each being a symmetrically disposed isosceles triangle.The lengths and thicknesses or ranges thereof, and the angles of the projections to the tube circumference can be chosen according to the requirements. (Both the angle of a projection to a radius of the tube and to the iongitudinal direction of the tube are open to selection.) As compared with the known bobbin tubes the tubes embodying the invention can offer the following advantages: a) The zone provided with projections 3 always maintains its structure, configuration and shape as it is an integral part of the tube itself. b) The fibres which adhere to the tube anchoring zone 2 when the roving 4 is wound round may easily be detached when the bobbin is emptied. No separate cleaning step is necessary. c) The cost of the bobbin tube with the automatic winding zone is practically the same as the cost of a conventional bobbin with no fixing zone because no special operation or additional parts are necessary. d) The risk of detachment of the projections (as happens with bobbins using felt etc.) is virtually eliminated, by having the needles or hooks moulded with the bobbin in one piece. Such factors as the materials employed to make the tube, its shape and dimensions, the extent and disposition of the area or areas with projections, and the degree(s) of rugosity or roughness of these can be varied, as will be understood by those skilled in the art. Claims

1. A spinning bobbin whereof at least a portion of the winding surface has integral projections, providing a rough surface for the automatic anchoring of the first winding coils.

2. A bobbin according to claim 1 wherein the bobbin with its projections is produced by moulding.

3. A bobbin according to claim 1 or 2 wherein the projections are provided in at least one annular recessed region.

4. A spinning bobbin substantially as described herein with reference to the accompanying drawings.

5. A method of spinning including the step of winding roving onto a bobbin according to any one of the preceding claims, wherein the roving is automatically anchored to a rough surface of the bobbin.