Patent GB-722966-A (GB)
IPC: D02G1/12
Abstract: 722,966. Crimping fibres. PERFOGIT SOC. PER AZIONI. Oct. 27, 1952 [Nov. 30, 1951 ; May 15, 1952], No. 27001/52. Class 120 (3). A device for crimping textile materials, in the form of filaments, tops, slivers, or bundles of filaments 20, comprises at least two propelling rollers as 10, 10<SP>1</SP>, one or more of which is driven, at least two subsidiary rollers as 11, 11<SP>1</SP>, mounted parallel thereto and in such a position as to oppose the travel of the material and defining with the rollers as 10, 10<SP>1</SP> a crimping chamber 12, Fig. 1, for which sealing means are provided at the two longitudinally opposed ends : the rollers 10, 10<SP>1</SP>, force the material into the chamber 12 whereby pressure is developed therein to crimp the material which is released when such pressure overcomes a means urging together the rollers 11, 11<SP>1</SP>, and as shown in Fig. 2, disengages the rollers from driving or other contact with each other and/or the rollers 10, 10<SP>1</SP>. In the operation of the modification shown in Figs. 3 and 4, the pressure of the material tends to move rollers 11, 11<SP>1</SP> apart against the resistance of springs 17, 171 or 18, 18<SP>1</SP>, and simultaneously to move the rollers away from the contacting rollers 10, 10<SP>1</SP> against the resistance of adjustable springs 16, 161, urging shafts 13, 13<SP>1</SP>, to slide in a radial direction on pivoted arms 14, 14<SP>1</SP> : when crimped material discharges easily from the chamber 12, rollers 11, 11<SP>1</SP> tend not to rotate, but if the pressure rises due to accumulating material, these rollers rotate to assist the discharge. The rollers 11, 11<SP>1</SP> may be constantly driven and compelled to rotate in the directions indicated in Fig. 2, means such as friction clutches being provided to prevent excessive friction between rollers 10, 10<SP>1</SP>, and 11, 11<SP>1</SP> in the initial stage of Fig. 1: alternatively the rollers 11, 11<SP>1</SP> may normally be free and driven only when they reach a certain separation and distance from rollers 10, 10<SP>1</SP> : thus as shown in Fig. 5, as rollers 11, 11<SP>1</SP> are forced apart against a spring 19, they approach driven rollers 21, 211 and are driven thereby when high pressure develops in the chamber : rollers 21, 211 may be internally located in hollow rollers 11, 11<SP>1</SP>. In a drive comprising a lost motion connection for the rollers 11, 11<SP>1</SP> from the rollers 10, 101, Fig. 7, rotation of the latter produces through eccentrics 40, 401, an alternating motion of cylinders 44, 441, and therefore of pawls 47, 471 which in their downward stroke slide without effect on the teeth of wheels 45, 45<SP>1</SP>, held by stop pawls 46, 461, and on the opposite stroke they engage these teeth and cause the ratchet wheels 45, 451, and therefore the rollers 11, 11<SP>1</SP> to rotate in the same directiou as the corresponding rollers 10, 10<SP>1</SP>, and thus complete one turn while the rollers 10, 101 complete as many revolutions as there are teeth on the wheel 45 or 45<SP>1</SP>. The rollers may have the same or different diameters, and one or both of each pair may be smooth surfaced or ribbed, knurled, toothed or otherwise rough surfaced. The spring means may be replaced by resilient, gravity, electromagnetic, or hydraulic means, and subsidiary devices or accessories, e.g. means for leading a lubricating liquid to the material, may be added.