GB479080A - Improvements in or relating to take-down mechanism - Google Patents

Abstract

479,080. Knitting - machines ; looms. RAVEN, R. F., and RAYNOR, H. A. Sept. 17, 1936, No. 10655/37. Divided out of 467,659. [Class 74 (ii)] [Also in Group IX] Relates to take-down mechanism suitable for use in circular machines for knitting small diameter tubular elastic fabrics and in other machines such as looms. Two or more pairs 52, 52a of take-down rollers are rotated by ratchet wheels 53, 54 respectively. Pivoted on the spindles carrying the ratchets are two rockers 56, 56a, each carrying, at one end, a roller or its equivalent 57 and being connected at its other end to a tension spring 58 anchored to a relatively stationary part. Each rocker carries a pivoted pawl 59, coacting with ratchets 53, 54. The rollers 57 are caused, by the rotation about a vertical axis of the takedown mechanism to traverse the inclined or suitably shaped underface of a ring or race 60, thus lowering the pawls 59 one or more teeth on the ratchets. If the tension in the fabric passing between a pair of rollers becomes great enough, it will cause thespring 58 to remain tensioned and that pair of rollers will not be rotated until this tension is lessened. In a modification, Fig. 5, the cam ring is divided into semicircular portions 60a, 60b, pivoted at 61, and oppositely inclined to give two racks per revolution to the take-down mechanism. The inclination of each half-ring is adjustable by means of a trunnion nut 64 and spindle 63 provided with a knob 65 and indicator 66. Alternatively, both halves may be simultaneously adjustable by means of toggle links connected to a common nut mounted on a spindle adjacent the axis 61. For insertion of the fabric, the roller may be moved apart by means of a lever 71, and mechanism similar to that described in Specification 357,323, means 72 may be provided to adjust the gap between the take-down rollers according to the grip desired or the fabric thickness. The rollers 57 engage the upper surface of the cam ring 60. A second pawl 73 associated with each ratchet wheel is operated by a spring 74 to prevent reverse rotation of the take-down rollers. Specification 467,659 also is referred to.