Patent GB-663116-A (GB)
Title: Improvements relating to the production and treatment of filamentary materials
IPC: F16F9/32
Filed: 1949-06-03
Abstract: <PICT:0663116/IV (a)/1> <PICT:0663116/IV (a)/2> <PICT:0663116/IV (a)/3> <PICT:0663116/IV (a)/4> A filament-producing or filament-treating apparatus has an opening in a wall thereof for the passage of filaments, a pivotally mounted door adapted to cover the opening, one edge of the door and one edge of the opening being formed so as to define a reduced filament aperture, and filament guide means mounted on or moving with the door, the aperture and guide means being both in one plane which is at right-angles to the axis about which the door is pivoted.  In the illustrated example, filaments 1 are shown in solid line as they pass downwards through the lower portion of a dry spinning metier or cabinet (shown in cross-section at 2 in Fig. 1) over the filament guide, indicated generally by the reference numeral 3, and through the filament aperture 4 to any suitable filament drawing, lubricating and take-up apparatus (not shown), the door 6 being closed for spinning.  The door 6 is pivotally mounted on a door frame 7 by means of a spring hinge 8, which is tensioned to hold the door in the open position, the door p  being held closed during spinning by suitable latching means.  The door frame 7 surrounds an opening in an inclined wall 9, near the lower end of the metier 2.  The filament guide 3 shown in Fig. 1, in Fig. 2 (which is a rear elevation on the line 2-2 of Fig. 1) and in detail in Fig. 4 (which is a plan view), includes a base portion 10, and an end portion 11 bent at an angle to the plane of the base portion 10.  A generally V-shaped notch 12 (Fig. 4), in the end portion 11 of the guide 3, provides a filament guiding opening, defined by arms 13 which converge on an insert 14 of wear-resisting material such as synthetic sapphire.  The bearing surface 16 of the insert 14 is suitably finished and rounded, and the filaments are led round it with a contact angle substantially below 60 degrees and preferably of 18-20 degrees, thereby reducing the frictional drag and tension on the filaments.  The filament guide 3 is adjustably and removably fastened to the door 6 by screws 17 passing through slots 18 in the base-portion 10, with the apex of the V-shaped notch 12 vertically aligned above the filament aperture 4.  This aperture may be defined by providing in the edge of the door 6 opposite its hinge, or in the corresponding edge of the door frame 7, a notch which is intersected by the other edge.  Alternatively registering notches may be provided for the same purpose in both edges.  A second filament guiding member 19 of stainless steel is shown in Figs. 1 and 2 and in Fig. 3 which is a cross-section of the door taken on the line 3-3 of Fig. 2, is mounted on door frame 7 by screws 20 (Fig. 3) and projects into the metier 2.  The leading edge of filament guiding member 19 is provided with two intersecting edges 22 and 23 forming a shallow V-shaped groove 24 which is above and vertically aligned with the V-shaped filament guiding groove 12. When spinning is started, the door 6 is opened to the position shown by the dotted lines in Fig. 1 and the filaments are led by the operator to the drawing &c. apparatus.  The filaments then assume the position shown by the dotted line in Fig. 1, riding on the filament guiding member 19, and are automatically centred by the V-shaped groove 24.  When the door 6 is closed, and during closing, the filaments are automatically picked off the filament guide 19 by the filament guide 3, which positions the filaments to pass through the aperture 4 without touching the sides thereof. The frictional drag on the filaments is said to be less in the apparatus of the invention than in conventional dry-spinning cabinets, and it is stated that the filament aperture need be only slightly larger than the bundle of filaments passing through it, thus reducing to a minimum the passage of air through the aperture during spinning.