Patent GB-134023-A (GB)
IPC: D01H9/04
Abstract: 134,023. Jackson, F., and Seccombe, R. F. Oct. 23, 1918. Doffing - arrangements. - A doffing- mechanism applicable to flyer and cap frames comprises interior members capable of both vertical and horizontal novemeuts and provided with pegs, holes, claws, &c. The members are capable of removing from the frame such parts as are necessary in the doffing-operation and of placing them upon a front receiving- mechanism, also of transferring such parts from the receiving - mechanism and placing them in the spinning position. The members and front receiving-mechanism are operated simultaneously and in the necessary relation one to the other by means operated from a single source working continuously during the doffing- operation. The invention is described as applied to a flyer frame with duplicate lifter-plates which are movable together with the full or empty bobbins in place thereon. The lifter-plates 6, 6a, Fig. 1, are adapted to be engaged by pegs on the heads 5 of the pokers 4. The frame members 2, 3 carry brackets supporting, in guides 13, rods 14 capable of vertical movement. Arms 16 capable of horizontal movement are supported at the upper ends of these rods. The arms 16 are provided with eyes 23 working vertically over portions 24, 24a of a lever device 25. The parts 24 are loosely jointed to the parts 24a and are kept perpendicular. The movements of the rods 14 and lever devices 25 are derived from a cam 27, Fig. 6, with two grooves 30 operating respectively the shafts 18, 26. The grooves are so designed that, for a full revolution, any point in the arms 16 follows a course as shown in Figs. 7 and 8. Brackets 31, 31a support in front of the frame the receiving-mechanism. This comprises vertically sliding rods 34 moving in guides 33 and provided with heads 35 having pegs to engage the lifterplates 6, 6<a>. At each side of the frame, are vertically sliding pieces 39 operated by an endless chain 40 driven from the mechanism controlling the doffer. The pieces 39 carry hinged heads 45 and also sockets 44 sliding on the rods 34 and adapted to engage the heads 35. Fig. 1 shows the frame stopped ready for doffing. The doffer then rises to lift the lifter-plate 6 and full bobbins 7 clear of the pokers 4. The shaft 26 is then rotated to push forward the arms 16 and move the plate 6 over the heads 45 of the pieces 39 which have in the meantime been raised by the chain 40, carrying with them the rods 34 with the lifter-plate 6<a> and empty bobbins. The doffer then falls to place the plate 6 upon the heads 45, which continue to rise until the plate 6<a>, with the empty bobbins, is on a level with the arms 16. These arms have meanwhile been retracted and immediately pushed forward again to engage the plate 6<a>, raised to remove it from the heads 45, and retracted again to place it above the pokers 4 and deposit it thereon. The pieces 39 are locked by a ratchet device until the final downward movement of the doffer, when they are released and fall by their own weight, or are lowered by hand. In falling, the rods 34 are the first to come to rest, and the lifter-plate 6 with the full bobbins is transferred from the heads 45 to the heads 35 on the subsequent movement of the pieces 39. The heads 45 are finally thrown over by a catch 48. The front receiving-mechanism may take the form of holders for the lifterplates sliding in vertical guides at the ends of the frame and carried by endless bands or chains. The endless chains have the necessary up and down movements imparted to them to receive the lifter-plate with the full bobbins and to present the plate with the empty bobbins. Another form of front receiving-mechanism comprises holders hung above their centres of gravity on pivots at the ends of oscillating arms mounted on a pivot working in vertical guides with angular extensions. Switches are arranged so that, as the arms descend during the latter part of the doffing operation and arrive at the point of the extension, the pivot and arms are turned to reverse the positions of the holders and the lifter-plates .carried thereby.