Patent GB-957994-A (GB)
Title: Improvements relating to apron mechanisms for spinning machines
IPC: D01H5/26
Filed: 1962-04-19
Abstract: 957,994. Drafting apparatus. SPINDELFABRIK SUSSEN, SCHURR, STAHLECKER & GRILL G.m.b.H. April 19,1962 [April 20, 1961], No. 15383/62. Heading D1D. In double-apron drafting-mechanism having an upper apron-roller detachably disposed in a loading saddle, and an upper apron-cage connected to the saddle by means allowing the cage to tilt about an axis parallel to or coaxial with the upper roller when the saddle is lifted, there is an arrangement of cage-loading means and/or a disposition of parts in relation to the said axis, so that, during lifting of the saddle, the cage is tilted together with the upper roller under the influence of the loading means or of gravity in such a way that the roversing-point of the upper apron is lifted away from the lower apron before the upper roller is lifted thereupon. The invention is described with reference to an arrangement of twin upper apron rollers on a common shaft on either side of a generally U- shaped saddle connected to the weighting-arm, each apron being guided by a cage providing a reversing- bar for each apron and having a central bridgemember. In Fig. 1, the saddle 1 has two depending cheeks 7 recessed to rest on and load the roller shaft 3, and the bridge 6 has a curved portion ovalying the shaft, a retaining spring 4 and two stub-shafts 11. The latter lie within, but do not quite engage, bearing portions of forward extensions 9 of the cheeks. A bolt 13 carried by the cheeks supports a spring 14, 14<SP>1</SP> bearing at one end against the underface of the top web of the saddle and at the other against the upper face of the reversing- bar-end 5 of the bridge. An interchangeable distance-piece 15 secured by a snap-fastener maintains the correct degree of separation between the upper and lower aprons. When the saddle is raised by lifting the loading-arm, the spring 14 first presses the bridge 6 in contact with the shaft 3 and the upper roller continues to bear on the lower roller; meanwhile the extensions 9 engage the stubs 11 and lift the reversing-bar end 5 of the bridge off the lower apron. With the rollers thus maintained in position, the sliver is held in place. The upper roller is only lifted after the end 5 has been lifted. When the saddle is lowered, the rolls come to rest against the lower roller before the nose-bars resume operative position. For cleaning the rollers, the latter may be removed after raising the saddle without reversing the bridge. In Fig. 3, the righthand end of the bridge is formed with two extensions overlying the shaft 33 and having downwardly curved parts 312 receiving a bolt 30 between the side-cheeks of the saddle, whereby the roller is weighted. The left-hand end of the bridge has a bent-up portion 311 and an aperture 316. A spring 314 with one end resting on a bolt 317 is curved as shown to lie along the part 311 and pass through the aperture 316 to bear at its other end against the distance-piece 315. In modifications of this form, Figs. 7 and 9 not shown, the spring, instead of being attached to the bolt 317 is secured to the bridge and is doubled back on itself to bear at intermediate of its length place against the distancepiece, its free end bearing beneath the shaft 33 to serve as a retaining-spring. In one case, the spring overlies the bolt 30; in the other, the bolt is dispensed with and the loading is effected by a member depending from and resiliently gripped by the cheeks with a slot through which pass both the bridge and the spring. In Fig. 5, the loading is effected by one of two arms of the saddle 518 which bears on a downwardly bent portion of the bridge. The spring 54 is anchored at one end in a recess of the saddle, and bears at the other against the underside of the bridge. In a modification of this form, Fig. 11 not shown, the spring instead of being anchored in the saddle is bent back upon itself and is located between the shaft and the overlying portion of the saddle; one end of the spring acts as a retaining-spring and the other bears in a recess on the upper side of the right-hand end of the bridge which extends beyond the shaft.