GB690283A - Improvements in apparatus for stretching and guiding tubular textile fabric - Google Patents

Abstract

690,283. Finishing fabrics. DUNGLER, J. April 12, 1950. [April 15, 1949; Nov. 18, 1949] No. 9010/50. Class 42 (i). Apparatus for stretching and guiding tubular textile fabric comprises external guide means, loose internal guide means freely rotatable inside the fabric and retaining means arranged externally of the fabric to restrain movement of the internal guide means inwardly of the fabric. As shown, Fig. 2, magnetic rings 6, located inside tubular fabric 9, are held by electromagnets 7 against the grooves of pulleys 3, 4, the fabric being pressed between the rings and pulleys. Rollers 4 are driven to forward the fabric, through gearing 10, 11. The fabric may be stretched longitudinally by taking it up at a speed greater than that at which it is fed by pulleys 4, or by braking pulleys 3. Each pair of pulleys 3, 4 is mounted with its associated electromagnet on a carriage 2 slidable on a support 1 ; carriages 2 are engaged by a lead screw 15 rotation of which, by a hand wheel 17, adjusts the distance apart of the two sets of pulleys. Two such assemblies may be arranged in series, Fig. 5, each pair of rings 6, 6a being' peripherally grooved and connected by an endless belt 29 ; the belts guide and stretch the fabric as it passes between the two assemblies. For restraining inward movement of rings 6, the electromagnets may be replaced by inclined rollers 18, 19, Fig. 3, surfaced with elastic material. Roller 19 can be swung about a pivot 24 for inserting the fabric 9 and clamped in the operative position by means of a handle 25. In another embodiment, pulleys 3, 4 are dispensed with, ring 6 being hollow and being held against inward displacement by rollers 18, 19 and against outward displacement by the fabric itself; carriage 2 carries a supporting surface for the innermost portion of ring 6. The ring 6 may have a peripheral sharp cutting edge for slitting the fabric longitudinally. In a further embodiment, Fig. 10, a pair of rings 43, 44 at each edge of the fabric 9 are journaled on a common support plate 45 and are retained, as in the last-mentioned embodiment, by inclined rollers above, the rings being formed in two halves positioned on opposite sides of support 45. A roller 50, carried by support 45, rests, through the fabric, on a roller 49 mounted on the carriage 2. An extension 52 of support 45 serves to guide the fabric close to a pick-up device 57. A cutting edge 56 may be provided for severing the fabric along its longitudinal fold line. Rings 43, 44 may be interconnected by a steel belt or other linkage. A number (e.g. three) of the assemblies shown in Fig. 10 may be disposed in planes at, say, 120 degrees to each other, to give the tubular article a triangular cross-section and cut the fabric into three portions of equal or different widths.