GB649836A - Improvements in devices for controlling the relative movement of two machine parts - Google Patents

Abstract

649,836. Winding bobbins. ALGEMEENE KUNSTZIJDE UNIE N.V. May 26, 1948, No. 14243. Convention date, June 20, 1947. [Class 120(ii)] [Also in Groups XXIV and XXX] Rigid fixing of a rod constituting the stationary one of twc relatively movable machine parts characterizes a ratchet device which comprises a tongue shaped part connected with the rod of said machine part, and with the other or movable machine part by two members exerting forces to maintain the tongue in a jamming position, one force acting in the free and the other in the locked direction of relative movement. As shown, applied to a cross winding machine, an arcuate rod 4, rigidly fixed to the machine frame 16, has sliding thereon with clearance one end of a loose tongue 9, the other end of which engages a slot in a member 7, pivoting about a shaft 15 and loaded by a counterbalance weight 22. An axle 23, loaded by a torsion spring 26, has a finger 25 attached to a part 24 thereof to force the tongue outwardly intermediate its two points of contact, and the whole arrangement is such that in the rest position an edge 19 of the slot in the member 7 tilts the tongue 9 until the sides of the bore therein jam on the rod 4. The finger 25 conveys outward movement of the tongue 9 on the rod 4 when the member 7 pivots outwardly on building up of the coil, but due to the tilting on the rod the tongue cannot move inwardly unless an arm 27 is depressed causing a finger 14' to engage the top thereof and free the jamming action. The edges of the tongue opening may be rounded off. The invention may be applied to tensile testing machines. U.S.A. Specification 2,165,018 is referred to.