Patent GB-190718071-A (GB)
Title: Improvements in or relating to Dobbie Looms for Weaving.
Inventor: BEAUMONT ROBERTS
Filed: 1908-03-09
Granted: 1908-10-01
Abstract: 18,071. Beaumont, R., and Hollis, T. March 9, 1908. Loom dobbies; shedding-levers; healds; shedding- motions.-In dobby looms, the heald shafts are rigidly connected or mounted in a rigid frame, which is positively moved up and down by rigid three-armed and two-armed levers, connected together and to the dobby. In one form, where dobbies with vibrator levers b, Fig. 1, are used, these levers are connected to thin sheet-metal or other recessed sliding levers s guided in grooves in plates u and in recessed guides t, which are inclined from back to front and are adjusted vertically by screws 8. Recessed vertical levers x pivoted on a shaft z pass through the recesses in the levers s, and are connected thereto by pins 3, which fit in slots in the vertical levers. The position of the pins is varied by the guides t, so as to vary the amount of movement of the ends of the levers x, the inclined guides producing an increasing amount of motion to the rear levers x in order from the front to the back of the loom, so that all the warps in the top and bottom of the shed respectively may be in the same plane. The levers x are connected by bifurcated links or bars 17, three-armed levers 18, rods 20, and loops 21, or pieces 150 or 151, Fig. 79, to one end of the shaft b, and by levers 22, bell-crank levers, and similar connexions to the other end of the shaft l. Flanged screws and flanged nipples may be used for connecting the parts 17, 20, 22 to the parts 18, 21. The shafts l, l<1>, Figs. 1 and 37, may be formed into rigid frames by being recessed to receive strips p provided with four disks or washers q, q<1>, above and below the shafts. Rivets may be passed through the shafts l, l<1> and strips p. The shafts may slide and be guided between wires or rods k, Fig. 27, mounted between uprights e on rails i, j, the former being bolted to a tilting carrier g pivoted on a shaft h, so that the frame can be tilted outwards as shown by dotted lines in Fig. 1. The guide-frames are retained in a vertical position by flanged or other pins r to pass through the frame e into the top rail j. Instead of a tilting frame, frames 143, Fig. 72, fixed by flanges 144 to the loom framework may be employed. The frames have recessed tilting plates 146 for guiding stays 62, Fig. 76, which have enlarged parts 149 for the shafts l, l<1> and also pins 148 for recesses in these shafts. Or a screw and nipple 3, 3<1>, Fig. 77, may be employed to secure the shafts to the stays, which may be bifurcated at one or both ends. The stays may be made of pieces of sheet metal, riveted together. Other guiding-frames are described below in connexion with a Keighley dobby. Eyes and loops for connecting the shafts and the links to the operating-levers are shown in Fig. 79. In a modification, motion is transmitted to the lower shafts l<1> from the vibrator gears, which are placed at one end of the loom, the top and bottom cylinders of the dobby being driven in this case by bevel-gearing from an upright shaft, driven from an horizontal shaft provided with a clutch and driven from the crank-shaft, the parts 17, 20, 18, &c. being situated below the shafts l<1> and the vertical levers pivoted at or above their centres. The parts 22 in this case are guided in a grate, and part of the upper framework of the loom is dispensed with. In another modification in which a Keighley or other positive dobby is used, levers 72, Fig. 42, actuated by the usual balk levers &c., are adjustably connected by bars 17 to levers 18 mounted on a spindle 66 carried in adjustable bearings, and by means of links 22 are connected to double-armed levers 23, Fig. 43. The bars 17, Fig. 42, may be slotted and made in two pieces adjustably secured together by bolts or nipples 88. The levers 18, 23 are connected by bars 20 to projections 63 on shoes 57, connected by stays or stretchers 62 to shoes 58, the shoes being provided with recesses for the shafts l, l<1>. The various levers may be provided with spacing-pieces 73, 74, 84, 77, and the front draw-knife may be inclined or act at an angle relatively to the back one, so that the back shafts may have a greater motion than the front ones. The shafts are guided in frames provided with metal sides e, Fig. 49, bolted to metal top and bottom rails j, g and provided with vertical rods k retained in position by plates n. One guideframe is mounted in a carrier 29 fixed to an arm 49, Fig. 43, provided with a pendent boss 55 for an adjusting-screw 52, the inner end of which fits into a recess in the vertical portion of a bracket 50, so that, by turning the hand-wheel 53, the guideframe e can be moved to and from the shafts l, l<1>. The arm 49 may be locked in position by a bolt 56. The other arm corresponding to 49 is fixed to the framework, as in Fig. 42. The parts 60, Fig. 43, of the shoes 57 are drilled to slide freely on the rods 7c. In a further modification, the rods 17 are connected directly to the balk levers 90, Fig. 64<a>, which have curved slotted extensions 97. 98 for guiding-spindles on the frame of the dobby. A further modification of this type is described, in which the connexions are made to the bottom shafts l<1> from the levers 72, which are extended downwards, the carrier 29 being fixed to the bottom of the frame e. Other slight modifications are also made in this case. In another modi6cation applicable to looms of the Schwabe type, Fig. 68, the levers 18, 23 are mounted in slotted bearings 101. The levers 72 are made as shown in Fig. 68, when the connexious are made to the top shaft l<1>, and as shown in Fig. 71 when the connexions are to the bottom shafts.