Guide flyer for yarn or strand

Abstract: The flyer comprises a body (1) having a flat cross section and having an aerodynamic profile, made of suitable mechanically strong material and provided with a longitudinal median channel (2) on whose bottom there is fitted a strip (3) made of steel or other suitable material and which is closed by another strip (6) made of steel or other suitable material, which is kept equidistant from and parallel to the preceding strip by bushes (8-108) made of ceramic or other suitable material, disposed between the said strips, at the sides of the channel. The said strips are fixed to the body of the flyer by means of screws, rivets or other suitable means (9-109) which pass through the said bushes.

Description: The present invention relates to guide flyers for yarn, rope or other filament-like material, to be employed in doubling frames, rope-making machines, stranding machines, or similar machines, in other words to those structures which are connected in the form of a link between the opposite ends of the rotating part of the said machines and which have the function of guiding the yearn longitudinally, preventing its deformation by centrifugal force. Document US-A-3 793 819 discloses a guide flyer for yarn, strand or any other filament-like material, to be employed in doubling frames, rope-making machines, stranding machines or similar machines. Said guide flyer comprises a body having a substantially flat cross section and having an aerodynamic profile, provided with a longitudinal median channel the bottom of which defines a first strip and which channel is closed by a second strip. The flyer according to the invention should provide a simplified construction and a high degree of reliability in operation. According to the present invention, there is provided a guide flyer of the type above disclosed comprising the features of the characterizing portion of claim 1. The characteristics of the flyer in question, and the advantages deriving therefrom, will be clearly understood from the following description which refers to the figures of the attached sheet of drawings, in which: Figure 1 is a plan portion view of the lyer; Figure 2 shows a transverse section through the flyer along the line II-II in Figure 1; and Figure 3 shows further details of the flyer in a section along the line III-III in Figure 2. It may be seen from the figures that the flyer comprises a body 1 having a flat cross section and having a suitably aerodynamic profile, made, for example, from carbon fibre or from any other material, including composite material, suitable for the purpose. The body 1 has a longitudinal channel 2, of rectangular section for example, in the median position on one face. The bottom of the channel 2 is lined with a strip 3 made of steel or other suitable strong material having a low coefficient of friction and such that it does not damage the yarn to be guided. As shown by the broken lines in Figure 2, the strip 3 may have a width greater than that of the channel 2, so that opposite portions 103 of the strip, which may be pierced or bent into the form of a fin if required, are embedded in the body 1 to provide it with greater strength. This variant may enable the body 1 to be made from less expensive and less strong materials than the carbon fibre mentioned previously. The strip 3 is provided with holes 4 and 104 located at short distances from the longitudinal edges of the strip and distributed over the whole length of the flyer with a constant and suitable spacing. The body 1 is provided with holes 5-105 aligned with the holes 4-104. The channel 2 is closed by a strip 6 of the same material as the strip 3, also provided with holes 7-107 at short distances from its longitudinal edges and aligned with the aforesaid holes 4-104 and 5-105. The strip 6 is kept parallel to the strip 3 and in the correct position to close the channel 2 by the interposition between the strips of identical bushes 8-108, made of ceramic or other suitable material, which are aligned axially with the holes 4-5-7 and 104-105-107 and through which pass bolts or screws 9-109 or other suitable means such as rivets or other devices by means of which the parts 6-8-108-3 are fixed to the body 1 of the flyer. From Figure 2 it may be seen that an ideal continuous tubular guide 10 is formed in the channel 2 which is covered and closed, and that the yarn or strand F runs in this guide and is sheltered from the dynamic wind, being supported on the strip 3 or 6 which is towards the outside, and supported on the row of bushes 8 or 108 which is opposite the leading edge of rotation of the flyer. In the figures, for example, it is assumed that the strip 6 is towards the outside and that the direction of rotation of the flyer is as indicated by the arrow Z. The dimensions of the guide 10 are suitably greater than the maximum diameter of the yarn or strand which is running in the flyer.

Claims: A guide flyer for yarn, strand or any other filament-like material (F), to be employed in doubling frames, rope-making machines, stranding machines or similar machines, comprising a body (1) having a substantially flat cross section and having an aerodynamic profile, provided with a longitudinal median channel (2) the bottom of which defines a first strip (3) and which channel is closed by a second strip (6), characterized by the fact that said first and second strip (3, 6) made of steel or other suitable material are fitted on the body (1) and said second strip (6) is kept parallel to and equidistant from the said first strip (3) by bushes (8-108) made of ceramic or other suitable material, arranged between said first strip and said second strip at the sides of said longitudinal channel (2). A guide flyer according to claim 1, characterised by the fact that the said first and second strips (3-6) are secured to the body (1) of the flyer by fastening means such as bolts, screws, rivets or other suitable means (9-109) which pass through the said bushes (8-108). A guide flyer according to claim 1, characterized by the fact that the said first strip (3) is secured to the body of the flyer by means of portions (103) which extend beyond the sides of the longitudinal channel (2) and which are embedded in the said body (1), while the second strip (6) is secured to the body (1) of the flyer by fastening means such as bolts, screw, rivets or other suitable means (9-109) which pass through the said bushes (8-108). A guide flyer according to any one of the preceding claims, characterised by the fact that the the said bushes (8-108) are arranged at the sides of the longitudinal channel (2) at suitable intervals of length, so as to suitably support the running yarn or rope (F) during operation of the guide flyer.

Inventors: MACCAFERRI ANGELO, MACCAFERRI, ANGELO
Applicants: MECCANICA DI PRECISIONE SPA, S.A.M.P. S.P.A. MECCANICA DI PRECISIONE
Application year: 1993
Main classification: D07B3
IPC codes: D07B7, D07B3