Patent GB-456977-A (GB)
Abstract: 456,977. Knitting. SPIERS, Ltd., W., Walnut Street, SPIERS, E., Rockford, Wimbourne Road, and HURD, J. C. H., Laneham, Kirkland Road, all in Leicester. May 16, 1935, No. 14311. [Class 74 (ii)] Yarn severing and trapping means consists of a bladed member intermittently rotated in one direction about an axis fixed radially with respect to the needle circle, and in timed relation with movable yarn feeders, the blade, or each blade, being adapted to engage a yarn withdrawn from knitting, to locate it in a yieldable trapping device (which can hold one or more yarns), and to co-operate with a part or parts for severing, or severing and trapping the yarn. As a bladed member 1 is rotated through part of a revolution by pawl-andratchet mechanism 11, 12, one of the radial blades 1<a> forces its way between a fixed block 3 and a pivoted spring-pressed trapping element 2, carrying down with it, a bight of the withdrawn yarn a. As the blade leaves the trapping element, the latter springs back to grip the yarn, whilst the bevelled leading edge 1<b> of the blade, co-operates with a fixed cutting edge 7 to sever the yarn. The device is mounted, together with pivoted or slidable yarn guides (e.g.pivoted guides 34) on a bracket 4 attached to the top cam box 5. The pawl-and-ratchet mechanism is actuated through a lever 17 by a cam 13 rotating with the top needle cylinder. The device may be rendered inoperative by a detent 20, which is spring-pressed to engage an extension of the lever 17. When the trapping and severing device is to operate, the detent 20 is moved to an inoperative position by a trip lever 23, controlled in turn by a cam drum 26. The drum is racked round as required by a pawl 29 operated, for example, by a cam ring 31 associated with the top needle cylinder 18, through intermediate connections. Associated yarn changing mechanism may be rendered inoperative at predetermined intervals by pattern means. The trapping and severing mechanism may be associated with pivoted yarn guides 34, Fig. 12 (not shown), moved into operative position by springs 39 and held in the inoperative position, against the spring action by cam pieces 40 on a pattern drum 41. A modification, Fig. 11, utilizes two spring- controlled trapping elements 36, 37, each blade 1<a> passing first between element 36 and the block 3, and then between element 37 and the block. In a further modification, Fig. 14, the revolving bladed member 1 itself constitutes one of the trapping elements. The bladed member, which is thicker than that of the previous constructions, is mounted on a horizontal spindle 47 which is supported in and extends at right angles to the the trapping face 45<a> of a fixed block 45. Between the member 1 and its ratchet wheel is interposed a suitably slotted plate 48 having a front cutting edge 48<a>, Fig. 13 (not shown). Between the pawl lever 15 of the ratchet wheel and an abutment plate 51, which are also mounted on the spindle, is a compression spring 50. When a guide 34 is moved to the inoperative position, its thread a, which extends across the front end of plate 48 and the block 45, is severed by the co-operation of the leading edge of the blade 1<a> and the cutting edge 48<a>, and simultaneously the thread is swept by the blade, between the bladed member 1 and the block 45, where it is trapped, the bladed member 1 yielding to allow this, by reason of the spring 50. It is stated in the Provisional Specification that the trapping means may be constituted by spring-pressed, nipper-like jaws.